Micro LED Backlight Structure for Thin Keyboard Integration
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Solution Overview
Problem
Conventional backlight devices in keyboards are limited by the thickness of edge light LEDs, which restricts the overall thickness of the device, making it difficult to integrate large electronic components within the limited space of mobile devices.
Innovation Solution
A light guiding structure incorporating a micro LED, a reflecting layer, a light guiding layer, and a reflecting film with a concave reflecting slope, allowing light to be projected perpendicularly and efficiently into the light guiding layer, reducing the overall thickness of the backlight device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If edge light LEDs are used to illuminate the light guiding sheet, then the light can be directly projected into the light guiding sheet, but the thickness of the edge light LED is larger than that of conventional direct light LEDs, making it difficult to reduce the total thickness of the structure
Solution Approach 1:
The patent changes the illumination direction parameter from parallel (edge light) to perpendicular (direct light), and uses micro LED technology to reduce the size parameter, thereby achieving both direct light projection and reduced thickness
Solution Approach 2:
Instead of using edge light LEDs that illuminate parallel to the substrate, the patent inverts the approach by using direct light LEDs that illuminate perpendicular to the substrate, fundamentally changing the lighting geometry to reduce thickness
2Length of stationary object
If the thickness of the keyboard is reduced, then the backlight device can be made thinner, but large electronic components are forced to be gathered and disposed outside of the keyboard, which limits the arrangement of electronic components in the mobile device
Solution Approach 1:
The patent merges the backlight device with the keyboard structure by integrating all necessary components (micro LED, reflecting layer, light guiding layer, diffusing layer, protecting layer) into a single compact assembly that can be disposed within the keyboard, eliminating the need to place components outside
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
This configuration enables a thinner backlight device suitable for slim keyboards by effectively utilizing small direct light micro LEDs, allowing for more compact integration of electronic components within mobile devices.
Implementation Method 1
The micro LED is arranged on the illuminating surface and illuminating toward a direction perpendicular to the illuminating surface
Implementation Method 2
light projected from the micro LED is reflected into the light guiding layer by the reflecting slope of the reflecting film
Data Source
AI summary
A light guiding structure of a backlight device having an insulation substrate, a micro LED, a reflecting layer, a light guiding layer and reflecting film. An illuminating surface is formed on the insulation substrate. The reflecting layer is stacked on the insulation substrate and stacked with the light guiding layer. The micro LED is arranged on the illuminating surface and illuminating toward a direction perpendicular to the illuminating surface. The reflecting film is stacked on the illuminating surface and covering on the micro LED, an edge of the light guiding layer is stacked between an edge of the reflecting film and the reflecting layer, a reflecting slope is defined on the reflecting film and extended from the micro LED to the edge of the light guiding layer. Light projected from the micro LED is reflected into the light guiding layer by the reflecting slope of the reflecting film.