Light Guide Device Uniform Illumination Segmentation
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Solution Overview
Problem
Existing light guide devices for vehicle instruments, such as speedometers and tachometers, suffer from unequal brightness illumination due to light attenuation with distance from the incident portion, leading to inconsistent illumination across the dial.
Innovation Solution
A light guide device featuring a light guide body with alternating light-guiding and non-light-guiding portions along its outer edge, where the light-guiding portions increase in length with distance from the incident portion and the non-light-guiding portions decrease, ensuring uniform illumination by controlling light distribution and preventing light from entering the decorated portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light is guided through the light guide plate from the incident portion, then the light can be transmitted to illuminate the dial, but the light amount decreases with distance from the incident portion causing unequal brightness
Solution Approach 1:
The light guide plate is divided into multiple light guide regions along the radial direction, with each region having different light guide properties. The first light guide region (closer to incident portion) has different light guide characteristics than the second light guide region (farther from incident portion), allowing differential light distribution to compensate for attenuation
Solution Approach 2:
Different portions of the light guide plate are given different optical properties. The light guide regions have different light guide capabilities matched to their distance from the incident portion, with the farther regions having enhanced light guide properties to compensate for greater attenuation
2Ease of operation
If the light guide plate uses total reflection to guide light, then light can be directed to the entire plate, but light attenuation occurs with distance reducing illumination effectiveness
Solution Approach 1:
The light guide plate is segmented into multiple light guide regions with different optical characteristics. Each region is optimized for its specific location, with the first region (nearer to incident portion) and second region (farther from incident portion) having differentiated light guide properties to maintain uniform illumination across the entire plate
Solution Approach 2:
The light guide parameters (such as refractive index, surface roughness, or internal structure) are changed across different regions of the light guide plate. The light guide regions have varying optical parameters to compensate for distance-related attenuation, ensuring consistent light distribution from the incident portion across the entire dial surface
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 achieves uniform brightness illumination across the decorated portion regardless of distance from the incident portion, enhancing visibility and reducing light attenuation, thus providing consistent and efficient transmitted light illumination.
Implementation Method 1
The display is configured to guide light which enters a light guide plate from an incident portion of the light guide plate disposed in the rear surface of the dial to the entire light guide plate through total reflection
Implementation Method 2
a decorated portion that is disposed to have contact with the light guide body, the decorated portion being made of a translucent material that guides the light guided in the light guide body to be emitted outside by scattering the guided light
Data Source
AI summary
A light guide device that performs uniform brightness transmitted light illumination regardless of a distance from an incident portion is provided. Light that is emitted from a light source, and enters from an incident portion of a light guide member (light guide body) made of a translucent member formed along an outer edge portion of a decorated portion, travels in the light guide portion while repeating total reflection by an inner surface of the light guide member. In the light-guiding portion, the light is guided in the decorated portion made of a translucent member from the inside of the light guide member, and is emitted outside by being scattered by the inside of the decorated portion, and in the non-light-guiding portion, the light that travels in the light guide member is prevented from traveling in the decorated portion.