Luminous Keyboard Backlight Module Uniform Illumination
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Solution Overview
Problem
Conventional backlight modules for keyboards and display panels suffer from non-uniform optical guidance and reduced illumination efficiency due to light attenuation and optical loss, particularly as light beams propagate over long distances and bypass light guiding points.
Innovation Solution
A luminous keyboard design featuring a backlight module with a light guiding plate, light guiding points, and upper and lower light-permeable thin films with refractive indices lower than the plate, facilitating total internal reflection and scattering of light beams to illuminate press keys, along with a luminous element and additional coatings for improved light utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional backlight modules use simple light guiding points, then the structure is simple, but the optical guidance effect is non-uniform and light attenuation is severe
Solution Approach 1:
The patent applies local quality by differentiating the functions of different regions within the light guiding plate. The light guiding points are strategically positioned and designed with specific optical properties to create localized light guidance zones, while the light-permeable thin films are placed at specific locations to control light transmission. This regional differentiation ensures uniform optical guidance effect across the keyboard surface without requiring complete structural redesign.
Solution Approach 2:
The patent employs composite materials by combining the light guiding plate (made of materials with specific refractive indices) with light-permeable thin films (made of different materials with complementary optical properties). This composite structure leverages the strengths of each material to achieve both structural simplicity and uniform optical guidance, resolving the contradiction between simple structure and effective light distribution.
2Area of stationary object
If light beams propagate over long distances in conventional backlight modules, then the keyboard coverage is extended, but light attenuation increases and illumination efficiency decreases
Solution Approach 1:
The light-permeable thin films act as intermediaries in the light transmission path. These thin films are positioned at strategic locations to facilitate light transmission from the light guiding plate to the keyboard surface. By introducing these intermediary elements, the system maintains efficient light transmission over extended distances, reducing energy loss while expanding the illuminated area.
Solution Approach 2:
The patent utilizes parameter changes by carefully selecting and optimizing the refractive indices of the light guiding plate and light-permeable thin films. By adjusting these optical parameters, the system minimizes light attenuation at interfaces and within the light guiding structure, enabling effective illumination over larger keyboard areas without significant energy loss.
3Productivity
If light beams bypass light guiding points in conventional backlight modules, then direct light transmission occurs, but optical loss increases
Solution Approach 1:
The patent extracts and isolates the light guidance function into discrete light guiding points on the light guiding plate. By separating this function from the bulk material properties, the system ensures that light beams are properly directed through intended pathways rather than bypassing guidance structures. This extraction approach, combined with the light-permeable thin films, minimizes optical loss while maintaining efficient light transmission.
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
Enhances light utilization and illumination efficiency by minimizing light attenuation and ensuring uniform illumination across the keyboard, thereby improving the overall optical performance.
Implementation Method 1
the upper and lower light-permeable thin films respectively have refractive indices lower than that of the light guiding plate so that a total internal reflection of the light beams occurs between the upper and lower light-permeable thin films
Implementation Method 2
the light guiding points scatter and direct the light beams to pass through the upper light-permeable thin film and to illuminate said press keys
Data Source
AI summary
A luminous keyboard includes: a press key unit and a backlight module unit including a light guiding plate, a plurality of light guiding points, an upper light-permeable thin film disposed on a top surface of the light guiding plate, a lower light-permeable thin film disposed on a bottom surface of the light guiding plate, and a luminous element. The upper and lower light-permeable thin films respectively have refractive indices lower than that of the light guiding plate.