Light Guide Plate Segmentation for Stereoscopic Display Efficiency
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Solution Overview
Problem
Existing stereoscopic displays face a decline in light use efficiency and deterioration in display quality due to the use of semi-transparent members and scattering particles, which affect the switching between two-dimensional and three-dimensional displays.
Innovation Solution
A light source device with a light guide plate featuring a total-reflection region and a scattering region, where the first illumination light is totally reflected and the second illumination light passes through, and a reflective member is used to reflect light from the scattering region back towards the total-reflection region, allowing efficient use of light for both display modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a semi-transparent member is used to switch between two-dimensional and three-dimensional displays, then switching capability is achieved, but light use efficiency deteriorates to 50%
Solution Approach 1:
The light guide plate's second internal reflection plane is segmented into two distinct regions: a total-reflection region that reflects first illumination light and a scattering region that allows second illumination light to pass through. This segmentation enables the single light guide plate to perform both two-dimensional and three-dimensional display functions without requiring a semi-transparent member, thereby maintaining high light use efficiency while achieving switching capability.
2Reliability
If scattering particles are used in the light guide plate, then three-dimensional display quality is improved, but display quality deteriorates due to scattering of direct light
Solution Approach 1:
The second internal reflection plane is divided into regions with different optical properties: the total-reflection region has high reflectivity for controlling light paths in three-dimensional display mode, while the scattering region has controlled scattering properties that allow light passage without degrading display quality. This local differentiation of optical properties enables simultaneous achievement of three-dimensional display quality and maintained display quality without using scattering particles throughout the entire light guide plate.
3Reliability
If a parallax barrier is disposed in front of the display panel, then three-dimensional display is achieved, but device complexity increases
Solution Approach 1:
The light guide plate is designed to serve multiple functions: it acts as both a light guide for two-dimensional display and as a parallax barrier structure for three-dimensional display through its differentiated internal reflection planes. By integrating the parallax barrier functionality into the light guide plate itself rather than adding a separate component, the invention reduces device complexity while maintaining three-dimensional display capability.
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 enables efficient light utilization and maintains high display quality by allowing the light guide plate to function as a parallax barrier, enabling seamless switching between two-dimensional and three-dimensional displays without reducing light use efficiency.
Implementation Method 1
a first light source applying first illumination light from a side surface of the light guide plate into an interior thereof
Implementation Method 2
the scattering region allowing the first illumination light to be reflected and scattered
Implementation Method 3
the reflective member is disposed in a position corresponding to the scattering region, and reflects light having passed through the scattering region, toward the first internal reflection plane
Data Source
AI summary
A light source device includes: a light guide plate having first and second internal reflection planes facing each other; a first light source applying first illumination light from a side surface of the light guide plate into an interior thereof; a second light source facing the second internal reflection plane, and applying second illumination light to the second internal reflection plane; and a reflective member between the second internal reflection plane and the second light source. The second internal reflection plane is provided with a total-reflection region allowing the first illumination light to be reflected in a total-internal-reflection manner whereas allowing the second illumination light to pass therethrough, and a scattering region allowing the first illumination light to be reflected and scattered. The reflective member is disposed in a position corresponding to the scattering region, and reflects light having passed through the scattering region, toward the first internal reflection plane.