Backlight Module Light Guide Plate Reflective Surfaces
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Solution Overview
Problem
Conventional backlight modules for keyboards create a dark zone on the back side of light emitting units due to uneven light distribution, which affects visibility in low-light environments.
Innovation Solution
A novel backlight module design featuring a light guide plate with a light guide structure comprising a first and second reflective surface, where the light beam emitted from a light emitting unit is guided to the second side, then reflected back to the first side via the second reflective surface, eliminating the dark zone by utilizing total reflection principles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If light emitting units are collectively disposed on one side of the light guide plate to save cost and achieve even light distribution, then cost is reduced and light distribution is improved, but the back side of the light emitting units becomes a dark zone
Solution Approach 1:
The light guide plate is segmented into multiple functional regions: an incident surface region for light entry, a first reflective surface region, and a second reflective surface region. This segmentation allows different parts of the light guide plate to perform different functions - the incident surface receives light from the LED, while the reflective surfaces redirect light to illuminate the keyboard from multiple directions, eliminating dark zones.
Solution Approach 2:
The light guide plate acts as an intermediary between the light emitting units and the keyboard surface. It includes specific reflective surfaces that mediate the light path, redirecting light from the LED to illuminate the keyboard evenly from the front and sides, thereby eliminating dark zones without requiring additional light sources.
2Ease of manufacture
If light emitting units are collectively disposed on one side of the light guide plate, then cost is reduced, but the back side of the light emitting units becomes a dark zone affecting visibility
Solution Approach 1:
The light guide plate is segmented into multiple functional regions: an incident surface region for light entry, a first reflective surface region, and a second reflective surface region. This segmentation allows different parts of the light guide plate to perform different functions - the incident surface receives light from the LED, while the reflective surfaces redirect light to illuminate the keyboard from multiple directions, eliminating dark zones.
Solution Approach 2:
The patent converts the harmful effect of light traveling in unwanted directions into a beneficial effect. By strategically positioning reflective surfaces, light that would otherwise create dark zones is redirected to illuminate the keyboard evenly. The reflective surfaces transform potentially harmful light paths into useful illumination, eliminating dark zones while maintaining cost-effectiveness.
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 design ensures even light distribution across the keyboard, eliminating the dark zone on the back side of light emitting units, enhancing visibility and usability in low-light conditions.
Implementation Method 1
a portion of the light beam is guided to the second reflective surface by the first reflective surface, and is further guided to the first side by the second reflective surface
Data Source
AI summary
The present disclosure discloses a backlight module, which includes a light guide plate and at least one light emitting unit. The light guide plate includes a first side and a second side opposite to each other, at least one accommodating portion and at least one light guide structure. The accommodating portion is adjacent to the first side and has an incident surface faced toward the second side. The light guide structure is disposed between the accommodating portion and the second side, and the light guide structure further comprises a first reflective surface and a second reflective surface. The first reflective surface is toward the first side and close to the accommodating portion. The second reflective surface is adjacent to the first reflective surface, and the second reflective surface is toward the first side and away from the accommodating portion. The light emitting unit is disposed in the accommodating portion.