Backlight Module Light Transmission Elements Dynamic Dimming
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Solution Overview
Problem
Conventional backlight modules lack a dimming mechanism, resulting in poor display contrast and high fabrication costs due to the need for numerous white LEDs with low beam directionality.
Innovation Solution
A backlight module design incorporating a light guide plate with light transmission elements that form multiple independent light reflection paths, allowing for dynamic dimming and using a single light source, such as a laser, to enhance light scattering efficiency and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple white LEDs are used to provide sufficient brightness, then illumination intensity is improved, but device complexity and fabrication costs increase
Solution Approach 1:
The light transmission element row is segmented into multiple individual light transmission elements (first light transmission elements and second light transmission elements) that can be independently controlled. This segmentation allows a single light source to illuminate multiple discrete elements, which then distribute light across the light guide plate, achieving sufficient brightness without requiring multiple LED arrays.
Solution Approach 2:
Light transmission elements serve as intermediaries between the single light source and the light guide plate. These elements receive light from the light source, perform partial reflection and partial transmission, and distribute the light across different regions of the light guide plate, thereby amplifying the effective illumination area without increasing the number of light sources.
2Area of stationary object
If white LEDs with low beam directionality are used, then illumination coverage is improved, but light scattering efficiency deteriorates
Solution Approach 1:
The patent replaces direct LED illumination with an optical system involving light transmission elements that use reflection and transmission mechanisms. Instead of relying on LED beam directionality, the system uses controlled optical paths through light transmission elements to achieve both wide coverage and efficient light scattering, substituting mechanical/structural optical design for source-dependent performance.
3Device complexity
If no dimming mechanism is provided, then device complexity is reduced, but display contrast deteriorates
Solution Approach 1:
The light transmission elements are designed with dynamic controllability, allowing them to be switched between different states (first light transmission elements that reflect and transmit light, and second light transmission elements that only transmit light). This dynamic capability enables real-time adjustment of light distribution and intensity, providing dimming functionality without adding complex mechanical dimming mechanisms.
Solution Approach 2:
Different regions of the light guide plate can have different lighting characteristics by selectively activating first or second light transmission elements in specific positions. This local quality control allows different areas to have different brightness levels, enhancing display contrast through spatially-resolved illumination control.
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 reduced fabrication costs, improved light scattering efficiency, and enhanced display contrast through dynamic dimming and high beam directionality, enabling more precise control over brightness and color saturation.
Implementation Method 1
Each of the light transmission elements reflects a part of the light beam to the light guide plate to than multiple independent light reflection paths
Implementation Method 2
the plurality of light transmission elements successively transmits a part of the light beam to form a light transmission path in the light transmission element row
Implementation Method 3
a laser light source may be used to cooperate with the light transmission elements to lower power consumption, and the feature of high beam directionality of a laser light source may enhance light scattering efficiency
Data Source
AI summary
A backlight module includes a light guide plate, a plurality of light transmission elements and a light source. The light guide plate has at least one light incident surface, and the light transmission elements are disposed near the light incident surface and aligned to from at least one light transmission element row. The light source is disposed near one end of the light transmission element row and capable of emitting a light beam to the light transmission element row. Each of the light transmission elements reflects a part of the light beam to the light guide plate to form multiple independent light reflection paths, and the light transmission elements successively transmits a part of the light beam to form a light transmission path in the light transmission element row.