Luminescent Keyswitch Module with Diffusion Structure and Reflector
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Solution Overview
Problem
Conventional illuminated keyboards suffer from uneven light distribution due to directly disposing light-emitting diodes on a membrane circuit board, resulting in a limited luminous effect and poor visual experience.
Innovation Solution
The luminescent keyswitch module employs a diffusion structure between the light source and light guide plate to increase the divergence angle of emitted light, combined with a reflector mounted on the base plate to enhance backlighting quality without obscuring the light, ensuring even illumination across keycaps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light-emitting diodes are directly disposed on a membrane circuit board to illuminate keycaps, then the keyboard provides visibility in dark places, but the light distribution becomes uneven and the luminous effect is reduced
Solution Approach 1:
A light guide plate is introduced as an intermediary component between the LED light source and the keycaps. The light guide plate receives light from the LEDs and guides it to illuminate the keycaps uniformly, solving the uneven light distribution problem while maintaining visibility in dark environments
Solution Approach 2:
A diffuser sheet is added as a low-cost component that scatters light to improve uniformity. This simple, inexpensive element effectively addresses the light distribution issue without requiring complex or expensive modifications to the existing LED setup
2Device complexity
If light-emitting diodes are directly disposed on a membrane circuit board, then the structure is simple, but the luminous region is limited to a small area affecting visual experience
Solution Approach 1:
The light guide plate extends the luminous region by distributing light across a larger area of the keyboard. This component transforms the localized light output from small LEDs into a broad, widespread illumination that covers the entire keyboard surface, significantly increasing the effective luminous area without adding complex mechanisms
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 provides a more uniform and improved luminous effect, enhancing the visual experience by distributing light more evenly across the keyboard, thereby addressing the limitations of conventional designs.
Implementation Method 1
The luminescent keyswitch module of the disclosure further includes a diffusion structure disposed next to a light source, so as to increase the divergence angle of the light emitted by the light source
Implementation Method 2
The reflector is disposed under the light guide plate, so as to reflect the light to sequentially pass through the light guide plate and the base plate to the keyswitch
Data Source
AI summary
A luminescent keyswitch module includes a base plate, a keyswitch, a light guide plate, a light source, a diffusion structure, and a reflector. The keyswitch is disposed on the base plate. The light guide plate, disposed under the base plate, has an accommodating space communicated with a through hole of the base plate. The light source passes through the through hole, is accommodated in the accommodating space, and emits light having a first divergence angle. The diffusion structure is accommodated in the accommodating space and located between the light source and the light guide plate. The light passes through the diffusion structure. The light leaving the second light exit surface has a second divergence angle larger than the first divergence angle. The reflector is disposed under the light guide plate, so as to reflect the light to pass through the light guide plate and the base plate to the keyswitch.