Backlight Unit Air Barriers for Scan Mode Uniformity
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Solution Overview
Problem
Existing backlight units face difficulties in driving in scan mode due to diffused reflection of light when using a light guide plate, which affects the uniformity and efficiency of light distribution in large LCD devices.
Innovation Solution
A light guide plate with a plurality of air barriers arranged at fixed intervals is used to convert spotted lights into two-dimensional light, guiding them in blocks and minimizing diffused reflection, thereby improving light directionality and reliability during scan mode operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a light guide plate is used to guide light from LEDs to divided blocks, then light distribution is achieved, but diffused reflection occurs making scan mode operation difficult
Solution Approach 1:
The light guide plate is divided into multiple light guiding portions, each corresponding to a specific block. Each light guiding portion has a dedicated light incident surface that receives light from specific LEDs, enabling independent light control for each block and facilitating scan mode operation without diffused reflection between blocks.
Solution Approach 2:
Different regions of the light guide plate are designed with different properties. Each light guiding portion has specific refractive indices and geometric configurations tailored to its function, allowing precise control of light direction and preventing diffused reflection while maintaining local light distribution efficiency.
2Illumination intensity
If LEDs are arranged on one side and light is guided to divided blocks, then block-specific lighting is achieved, but light directionality is lost due to diffused reflection
Solution Approach 1:
The patent introduces a vertical dimension to light control by creating multiple light incident surfaces at different positions and angles. Each surface is oriented to receive light from specific LEDs and direct it to the corresponding block, maintaining light directionality while preserving guiding efficiency through three-dimensional optical path design.
Solution Approach 2:
The refractive indices of different portions of the light guide plate are varied to control light behavior. By adjusting refractive index parameters in different regions, the patent achieves precise light directionality while maintaining overall light guiding efficiency through optimized optical parameters.
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 the ability of backlight units to drive in scan mode by effectively guiding light in blocks, reducing diffused reflection and improving light uniformity and efficiency, particularly in large LCD devices.
Implementation Method 1
a light guide plate disposed parallel to the light sources and converting spotted lights entered from the light sources into two-dimensional light
Implementation Method 2
The light guide plate includes a plurality of air barriers arranged at a fixed interval and guiding lights from the light source in blocks with a width corresponding to the fixed interval
Data Source
AI summary
A backlight unit being scan-driven is discussed. The backlight unit according to an embodiment includes light sources configured to emit light, and a light guide plate disposed parallel to the light sources and configured to convert spotted lights entered from the light sources into two-dimensional light. The light guide plate includes a plurality of air barriers arranged at a fixed interval and configured to guide lights from the light sources in blocks with a width of the fixed interval.