3D Display Backlight Microstructures for Orientation-Independent Stereoscopic Effect
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Solution Overview
Problem
Traditional three-dimensional display apparatuses that do not require special glasses lose stereoscopic visual effect when rotated, as the directional splitting of light is compromised when the viewer's eyes are vertical to the light guide plate.
Innovation Solution
A backlight module with a light guide plate and microstructures disposed on its surfaces, where first and second light sources emit light at specific angles, allowing peak areas to shift and maintain stereoscopic image separation regardless of the display's orientation, using microstructures that alter light direction and peak areas along the diagonal of the light guide plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If prismatic structures are disposed on the light guide plate to split light directionally, then stereoscopic visual effect is provided when viewer's eyes are parallel to the long axis, but the stereoscopic effect is lost when the display apparatus is rotated to vertical position
Solution Approach 1:
The patent introduces asymmetric microstructures (pyramid-shaped light directing structures) on the light guide plate that are oriented at specific angles (45 degrees) relative to the long axis. These asymmetric structures redirect light at multiple angles simultaneously, enabling the stereoscopic effect to be maintained regardless of whether the display is in horizontal or vertical orientation, thus resolving the contradiction between maintaining stereoscopic effect and allowing display rotation.
Solution Approach 2:
The patent transitions from traditional prismatic structures that operate in one dimension (splitting light along the long axis) to microstructures that operate in multiple dimensions by redirecting light at various angles (including 45 degrees) relative to both the long and short axes. This multi-dimensional light redirection enables the system to maintain stereoscopic effect across different display orientations.
2Reliability
If light is split directionally using prismatic structures, then separate images are provided to left and right eyes in horizontal position, but light distribution becomes ineffective when viewer's eyes are vertical to the light guide plate
Solution Approach 1:
The patent employs asymmetric pyramid-shaped microstructures with specific angular orientations (45 degrees) that create asymmetric light redirection patterns. These structures redirect light not only along the long axis but also at 45-degree angles toward the short axis, ensuring that separate images are delivered to the left and right eyes regardless of whether the viewer is in horizontal or vertical position, thus maintaining reliability across different orientations.
Solution Approach 2:
The patent applies microstructures with specific local orientations (45 degrees relative to the long axis) at different locations on the light guide plate. This local quality differentiation ensures that light is redirected at appropriate angles from each region, maintaining effective light distribution and image separation across the entire display area in both horizontal and vertical viewing positions.
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
Ensures the viewer receives separate images for each eye in both landscape and portrait modes, maintaining the stereoscopic effect regardless of the display's orientation by shifting light peak areas along the diagonal of the light guide plate.
Implementation Method 1
The first light source and the second light source are activated alternatively to form backlights with different light emitting angles in different time periods. When the first light source is activated, the light emitting direction is changed by the microstructures after light is incident on the light guide plate, so that the first peak area of light is shifted toward the first light source.
Data Source
AI summary
A three-dimensional display apparatus and a backlight module thereof are provided. The display apparatus further includes a display panel disposed on the backlight module. The backlight module has a light guide plate, a plurality of microstructures, a first light source, and a second light source. The light guide plate has a bottom surface and a light emitting surface opposite to the bottom surface, wherein the microstructures are disposed on at least one of the two surfaces. The first light source is at a first corner of the light guide plate while the second light source is at a second corner opposite to the first corner. A first surface and a second surface of the microstructure define an orientation direction (or form a distribution direction) along or parallel to the diagonal line through the first and second corners.