Double-Sided Light Guiding Strip for Backlight Weight Reduction
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Solution Overview
Problem
Existing backlight modules, such as side-lit and direct-lit types, face limitations including weight, cost, and thickness due to the need for light guide plates and additional circuit boards, and have restricted LED pitch and light mixing areas.
Innovation Solution
A double-sided planar light apparatus utilizing light guiding strips with light diffusion patterns that emit light in two directions, eliminating the need for light guide plates and allowing increased LED pitch, reduced thickness, and independent control of light emission directions through reflectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light guide plate is used in side-lit backlight module, then light can be uniformly irradiated, but the module becomes heavier and more complex
Solution Approach 1:
The patent extracts and eliminates the light guide plate from the backlight module structure. Instead of using a separate light guide plate component, the invention integrates light guiding functionality directly into the LED assembly, allowing LEDs to emit light directly through the display area without requiring an additional light guide plate, thereby reducing weight and structural complexity
Solution Approach 2:
The patent merges the light source (LED) and light guiding functions into a single integrated structure. The LED assembly is designed to directly illuminate the display area without requiring separate light guide components, combining multiple functions into one unified structure that reduces overall module weight and complexity
2Ease of manufacture
If LED pitch is increased in direct-lit backlight module, then manufacturing is easier, but light mixing area is restricted and uniformity deteriorates
Solution Approach 1:
The patent applies local quality by creating different optical characteristics in different regions of the LED assembly. The LED structure incorporates specific optical design elements that enhance light diffusion and mixing in the local display area, allowing larger LED pitch while maintaining uniform light output through localized optical optimization
Solution Approach 2:
The patent addresses light mixing by utilizing the vertical dimension and optical path design within the LED assembly structure. By optimizing the three-dimensional light path and incorporating optical elements that extend light mixing in multiple dimensions, the system achieves uniform illumination even with increased LED pitch
3Ease of operation
If additional circuit board is added in direct-lit backlight module, then LED control is improved, but cost and complexity increase
Solution Approach 1:
The patent merges the control circuitry directly into the LED assembly structure, eliminating the need for a separate circuit board. The LED driver and control elements are integrated with the LED mounting structure, reducing the number of discrete components and simplifying the overall module architecture while maintaining LED control functionality
Solution Approach 2:
The LED assembly structure is designed to serve multiple functions simultaneously: mechanical support for LEDs, electrical connection, heat dissipation, and light emission. This multi-functional integration eliminates the need for separate dedicated circuit board and support structures, reducing overall complexity
4Illumination intensity
If light mixing distance is increased, then light uniformity is improved, but module thickness increases
Solution Approach 1:
The patent replaces the traditional mechanical approach of using long light mixing paths with optical design solutions. By incorporating optical elements and designing the LED structure to inherently diffuse and mix light through optical paths rather than relying on long physical distances, the system achieves uniform illumination in a compact thickness
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 a uniform and efficient light output, reducing the weight and cost of backlight modules while increasing LED pitch and reducing module thickness, enabling thinner and more cost-effective displays.
Implementation Method 1
a light guiding strip, in which the light emitted by LED at two ends of the light guiding strip is concentratedly irradiated out from an arced surface of the light guiding strip
Implementation Method 2
each of the plurality of light guiding strips including a first plurality of light emitting surfaces disposed toward a first direction and a second plurality of light emitting surfaces disposed toward a second direction
Data Source
AI summary
A light guiding strip and a double-sided planar light apparatus are provided. According to one embodiment of the present invention, the double-sided planar light apparatus includes a plurality of light guiding strips, wherein the plurality of light guiding strips are positioned in a planar arrangement, each of the plurality of light guiding strips including a first plurality of light emitting surfaces disposed toward a first direction and a second plurality of light emitting surfaces disposed toward a second direction, each of the plurality of light guiding strips further including a first end and a second end configured to receive light, wherein the plurality of light guiding strips emit light from the first and second plurality of light emitting surfaces. Reflectors and light diffusion patterns on the light guiding strips provide control and independence over the two sides of the planar light apparatus.