Backlight Device With Inclined Incident Surfaces
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Solution Overview
Problem
Conventional backlight devices experience color unevenness on the incident surface of the light guide plate due to the predetermined directivity angles of light emitted from first and second illuminants, resulting in regions where the lights do not overlap, leading to inconsistent illumination.
Innovation Solution
A backlight device design featuring a light guide plate with inclined second incident surfaces and strategically arranged green and red illuminants, where the green illuminants face the first incident surface and the red illuminants face the second incident surfaces, ensuring that the overlapping region of their light emissions is closer to the first incident surface, thereby reducing color unevenness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If first illuminants and second illuminants are arranged with predetermined directivity angles, then the light mixing region is positioned away from the incident surface, but color unevenness occurs on the incident surface side of the light guide plate
Solution Approach 1:
The patent introduces asymmetric second incident surfaces that are inclined relative to the first incident surface. This asymmetric geometry causes light from the second illuminants to refract at different angles, redirecting the light mixing region toward the first incident surface and eliminating the color unevenness caused by symmetric arrangements
Solution Approach 2:
The patent adds a dimensional element by inclining the second incident surfaces at specific angles (e.g., 45 degrees) relative to the first incident surface. This angular dimension changes the light propagation path within the light guide plate, bringing the mixing region closer to the incident surface without compromising mixing efficiency
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 effectively suppresses color unevenness on the incident surface by directing the mixing region of red, green, and blue light components closer to the first incident surface, improving color reproducibility and reducing the area of uneven color, thus enhancing the overall illumination quality.
Implementation Method 1
a light guide plate (3) including a first incident surface (31), and one or more second incident surfaces (32) that are connected to the first incident surface (31) and inclined with respect to the first incident surface (31) in a top plan view
Implementation Method 2
the green illuminant (5) is arranged to face one of the first incident surface (31) and the second incident surface (32), and the red illuminant (6) is arranged to face the other of the first incident surface (31) and the second incident surface (32)
Data Source
AI summary
A backlight device includes a light guide plate including a first incident surface, and one or more second incident surfaces that are connected to the first incident surface and inclined with respect to the first incident surface in a top plan view; at least one green illuminant arranged to face one of (i) the first incident surface and (ii) the one or more second incident surfaces; and at least one red illuminant arranged to face the other of (i) the first incident surface and (ii) the one or more second incident surfaces. At least one of (i) the green light emitted from the green illuminant, and (ii) the red light emitted from the red illuminant, contains a blue component whose emission peak wavelength is 420 nm to 500 nm.