Backlight Module Shading Plate for Uniform Illumination
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Illuminated keys in electronic devices often exhibit uneven brightness due to the arrangement of backlight modules, leading to poor visual effects and aesthetics.
Innovation Solution
A backlight module comprising a reflector, light guide plate, light source, and shading plate with a translucent area and diffusing elements, where the shading plate has a shading area and a translucent area with specific transmittance and scattering particles, and diffusing elements such as concave-convex microstructures on the light guide plate, to distribute light uniformly and soften the edges of diffusing elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a backlight module is placed below key structures to create illuminated keys, then visibility and aesthetics are improved, but brightness uniformity deteriorates due to specific areas being particularly brighter
Solution Approach 1:
A translucent plate is introduced as an intermediary component between the light guide plate and the key structures. This plate contains translucent areas with higher transmittance positioned at locations corresponding to diffusing elements, thereby mediating the light distribution to achieve uniform brightness without requiring complex restructuring of the backlight module
Solution Approach 2:
The translucent plate implements local quality by having different transmittance properties in different areas. The translucent areas with higher transmittance are specifically positioned at locations corresponding to diffusing elements where additional light control is needed, while other areas maintain standard transmittance, thus achieving brightness uniformity through localized optimization
2Illumination intensity
If diffusing elements are arranged on the light guide plate to distribute light, then light distribution is improved, but over-brightness at specific locations occurs
Solution Approach 1:
The translucent plate converts the harmful effect of over-brightness at diffusing element locations into a benefit by using translucent areas with higher transmittance to selectively transmit additional light to these specific locations, thereby compensating for the brightness unevenness and achieving overall uniformity
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 improved brightness uniformity and optical effects by mitigating over-brightness issues at diffusing elements, resulting in a more aesthetically pleasing and uniform illumination across the input device.
Implementation Method 1
a light guide plate (120), having a plurality of diffusing elements (121)
Implementation Method 2
a light guide plate (120), having a plurality of diffusing elements (121)
Implementation Method 3
a shading plate (140A)... having a shading area (141) and a translucent area (142)... a plurality of scattering or diffusion particles are arranged in the translucent area (142)
Data Source
AI summary
An input device including a bracket, key caps and a black light module is provided. The key caps are disposed on the bracket. The backlight module is disposed under the bracket, and includes a light guide plate, a light source and a shading plate. The light guide plate includes diffusing elements arranged at a position corresponding to an opening of the bracket. The light source is disposed on a side of the light guide plate. The shading plate is disposed on the light guide plate, and includes a transparent sheet, an opaque layer and a translucent coating. The opaque layer is disposed on the transparent sheet correspondingly between two adjacent key caps, and the translucent coating overlaps a portion of the opaque layer on the transparent sheet.