Light Source Device with Visual Field Limiting Film for Uniform Directivity
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Solution Overview
Problem
Existing light source apparatuses for display systems face challenges in achieving high directivity and uniformity of light emission, leading to increased power consumption and insufficient luminance, particularly when used for observing three-dimensional images.
Innovation Solution
A light source apparatus comprising a group of directional light-emitting sources and a first diffusing body that homogeneously diffuses light within a predetermined angular range, utilizing a visual field limiting film to achieve high directivity and uniformity, and optionally incorporating light deflecting bodies and additional diffusing bodies to further control light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the luminance of the backlight is increased to compensate for light loss through the parallax barrier and liquid crystal panel, then the luminance becomes sufficient for observation, but the power consumption increases significantly
Solution Approach 1:
The patent applies local quality by making the light emission directional rather than omnidirectional. The light emitting elements are configured to emit light primarily in the forward direction toward the display panel, concentrating energy where it is needed rather than radiating in all directions. This localized light emission improves luminance efficiency while reducing the total power required.
Solution Approach 2:
The patent changes the angular distribution parameter of light emission from isotropic (uniform in all directions) to directional (concentrated in specific directions). By modifying the emission pattern parameter, the system achieves better light utilization efficiency, requiring less total luminance output to achieve the same effective illumination, thereby reducing power consumption.
2Stability of the object's composition
If a diffusion plate is used to diffuse light in all directions, then light distribution becomes uniform, but the directivity of light emission is lost and luminance efficiency decreases
Solution Approach 1:
Instead of using a diffusion plate that uniformly scatters light in all directions, the patent applies local quality by creating directional light paths. The light guiding structure directs light locally toward specific areas of the display panel, maintaining both directionality and uniformity through structured light guidance rather than random diffusion.
Solution Approach 2:
The patent introduces a light guiding structure as an intermediary between the light emitting elements and the display panel. This intermediary component replaces the diffusion plate and performs the function of distributing light uniformly while maintaining directional emission, acting as a mediator that reconciles the conflicting requirements of uniformity and luminance efficiency.
3Stability of the object's composition
If multiple light sources are arranged to cover the entire display area, then uniform illumination is achieved, but the device complexity and size increase
Solution Approach 1:
The patent applies universality by designing a light guiding structure that serves multiple functions simultaneously: it guides light from a limited number of sources, distributes light uniformly across the display area, and maintains directional emission. This multi-functional component replaces what would otherwise require multiple separate light sources and complex distribution mechanisms.
Solution Approach 2:
The light guiding structure acts as an intermediary that enables a small number of light sources to effectively illuminate a large display area. This mediator component expands the functional capability of the light source subsystem, allowing uniform illumination to be achieved with fewer sources than would otherwise be required.
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 enables the emission of light with high directivity and uniformity, reducing power consumption and enhancing luminance while maintaining efficient light utilization and minimizing luminance unevenness.
Implementation Method 1
a light emitting body group 11a in which a plurality of light sources 11 that emit directional light are arranged on one surface
Implementation Method 2
a first diffusing body 12 that is provided on an optical path of the light emitted from the plurality of light sources, and outputs light that enters the first diffusing body in a first predetermined angular range by homogeneously diffusing the light within the first predetermined angular range
Data Source
AI summary
Light having high directivity and high uniformity is emitted. A light source apparatus (10) according to the present invention includes: a light emitting body group (11a) in which a plurality of light sources (11) that emit directional light are arranged on one surface; and a first visual field limiting film (12) that is provided on an optical path of the light emitted from the plurality of light sources (11), and outputs light that enters the first visual field limiting film in a first predetermined angular range by homogeneously diffusing the light within the first predetermined angular range.