Keyboard Backlight Shielding Layer for Light Leakage Control
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Solution Overview
Problem
Backlit keyboards experience light leakage through the gap between the keycap and the keyboard casing, leading to reduced visibility and accuracy in low-light environments due to the halo phenomenon caused by incomplete light irradiation.
Innovation Solution
A keyboard backlight module with a shielding layer that includes a light transmission area and a light block portion, strategically positioned to cover regions where light paths intersect, effectively blocking light leakage and ensuring consistent illumination of the keycap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light source is provided to illuminate the keyboard keys, then the visibility of letters and symbols on the keys is improved in low-light environment, but light leaks from the gap between the keycap and the keyboard casing causing recognize difficulty
Solution Approach 1:
The shielding layer is divided into distinct functional zones: a light transmission area that allows light to pass through to illuminate the keycap, and a light block portion that prevents light from reaching the gap. This segmentation enables different regions of the same component to perform different functions, resolving the contradiction between illumination and light leakage prevention.
Solution Approach 2:
Different regions of the shielding layer are given different optical properties: the light transmission area has high light transmission properties while the light block portion has high light blocking properties. This local differentiation of quality allows the shielding layer to simultaneously achieve illumination and prevent light leakage in different locations.
2Object-affected harmful factors
If the shielding layer covers the gap area, then light leakage is prevented, but the illumination of the keycap is reduced
Solution Approach 1:
The shielding layer is segmented into a light transmission area positioned to illuminate the keycap and a light block portion positioned to cover the gap. This spatial segmentation ensures that light blocking and light transmission functions are performed in different locations, preventing the trade-off between these two functions.
Solution Approach 2:
The solution moves from a one-dimensional approach (either block or transmit light) to a two-dimensional approach where different regions of the shielding layer perform different functions. By utilizing the planar dimension of the shielding layer, both illumination and light leakage prevention are achieved simultaneously in different areas.
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 prevents light leakage and halo formation, enhancing keycap visibility and user operation accuracy by ensuring that light is directed effectively onto the keycap, even in low-light conditions.
Implementation Method 1
the light block portion is located in the light transmission area and covers a region where at least one light path passes through the gap and intersects the light transmission area through
Data Source
AI summary
An electronic device is provided here, which includes a casing, a keycap and a keyboard backlight module. The casing has a first opening. The keycap is disposed corresponding to the first opening, and a gap is formed between the keycap and a periphery of the first opening. The keyboard backlight module includes a shielding layer, the shielding layer includes a light transmission area corresponding to the first opening and a light block portion, and the light block portion is located in the light transmission area and covers a region where at least one light path passes through the gap and intersects the light transmission area through.