Backlight Keyswitch Optical Layer Layout for RGB Color Shift
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Solution Overview
Problem
Existing backlight keyswitch designs experience color shift issues due to different mixing distances of RGB LEDs, leading to non-uniform lighting and visual effects.
Innovation Solution
The proposed backlight keyswitch incorporates a backlight module with a light guide plate, a micro optical layer, and a specific ink layer design. The micro optical layer forms clearance areas near each lighting unit, and the ink layers are strategically placed to mix and filter color lights, ensuring uniform illumination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If RGB LEDs are arranged side by side to provide keyswitch lighting, then the lighting function is achieved, but color shift occurs due to different mixing distances between LED chips and symbols
Solution Approach 1:
A light guide plate is introduced as an intermediary component between the RGB LED chips and the symbols. The light guide plate includes a light mixing region where light from different colored LED chips travels and mixes before reaching the symbol, ensuring uniform color distribution across the entire symbol area regardless of the LED chip arrangement
Solution Approach 2:
The patent transitions from a two-dimensional arrangement of LED chips side by side to a three-dimensional light mixing structure. By creating a light mixing region with specific depth and optical path design, the system allows light to mix in the vertical dimension before reaching the symbol, effectively eliminating color shift issues caused by horizontal LED chip positioning
2Use of energy by moving object
If different colored LED chips are placed close to symbols, then lighting efficiency is improved, but color shift problems arise in different areas of the symbol
Solution Approach 1:
The light guide plate is segmented into different functional regions: a light mixing region where light from different colored LED chips mixes, and a light output region where the mixed light is uniformly distributed to the symbol. This segmentation allows efficient light collection from closely positioned LED chips while ensuring uniform color distribution across the symbol
Solution Approach 2:
The patent changes the optical parameters within the light mixing region by controlling the thickness, refractive index, and microstructure of the light guide plate. These parameter changes enable effective light mixing and uniform color distribution, allowing LED chips to be positioned close to the symbol for high lighting efficiency while maintaining color consistency
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 design effectively eliminates color shift issues, enhancing lighting uniformity and visual effects by ensuring that the mixed colors from different lighting units are consistent across the keyswitch.
Implementation Method 1
The micro optical layer is disposed in parallel to the light guide plate and formed corresponding to the at least one transparent region for guiding the first color light, the second color light, and the third color light to emit from the light guide plate
Implementation Method 2
The first color light, the third color light and the second color light are mixed in the first clearance area to obtain a first mixed color, the first color light, the third color light, and the second color light are mixed in the second clearance area to obtain a second mixed color
Data Source
AI summary
A backlight keyswitch includes a backlight module and a keyswitch body having a cap with a symbol. The backlight module disposed under the cap includes a light guide plate, a light-blocking sheet, a backlight circuit board having first, third, and second lighting units disposed in the light guide plate and arranged sequentially along a longitudinal direction for emitting first, third, and second color lights respectively, and a micro optical layer. The light-blocking sheet is located above the backlight circuit board and has a transparent region. The light guide plate is located between the light-blocking sheet and the backlight circuit board. The micro optical layer is parallel to the light guide plate and formed corresponding to the transparent region to guide the first, second, and third color lights to the symbol and has first and second clearance regions respectively adjacent to the first and second lighting units in the longitudinal direction.