Stereoscopic Display Light Collecting Unit Brightness
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Solution Overview
Problem
Stereoscopic image display devices face limitations in achieving optimal viewing distance and maintaining brightness due to the thickness constraints and light-blocking issues associated with parallax barriers and lenticular lenses.
Innovation Solution
A stereoscopic image display device with a rear barrier and a light collecting unit that includes a prism sheet or lenticular lenses, positioned between the rear barrier and the backlight unit, to collect and refract light, thereby improving brightness and extending the optimal viewing distance without increasing the device's thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a separate gap glass is added in the front or rear of the parallax unit to extend optimal viewing distance, then optimal viewing distance is improved, but device thickness increases
Solution Approach 1:
The patent transitions from a planar parallax barrier to a three-dimensional microlens array structure. The microlens array introduces a vertical dimension with varying focal lengths, enabling extended optimal viewing distance without increasing horizontal device thickness. The layered configuration of microlenses at different depths creates multiple focal planes that accommodate various viewing distances.
Solution Approach 2:
The patent employs microlenses with varying focal lengths arranged in a specific pattern. By changing the focal length parameter of individual microlenses based on their position in the array, the system achieves extended optimal viewing distance. The focal length parameter is modulated across the array to create different optical paths for left and right eyes at various viewing distances.
2Manufacturing precision
If pitches of unit lenses in parallax unit are reduced to improve resolution, then resolution is improved, but optimal viewing distance becomes limited
Solution Approach 1:
The patent adds a vertical dimension to the parallax unit by stacking microlenses at different depths. This three-dimensional arrangement allows the system to maintain fine horizontal pitch for high resolution while using vertical depth variation to extend optimal viewing distance. The multiple focal planes created by different depth layers accommodate various viewing distances without compromising horizontal resolution.
Solution Approach 2:
The parallax unit is segmented into multiple groups of microlenses, each group containing microlenses with different focal lengths. This segmentation allows different regions of the array to optimize for different viewing distances while maintaining overall high resolution. Each segment operates semi-independently to provide resolution benefits while collectively extending the optimal viewing distance range.
3Adaptability or versatility
If rear barrier is used to extend optimal viewing distance, then optimal viewing distance is improved, but brightness is reduced due to light blocking
Solution Approach 1:
The patent replaces the mechanical light-blocking approach of traditional rear barriers with an optical system using microlenses. Instead of using opaque structures to create parallax effects, the system uses refractive optics to bend and direct light. This substitution maintains brightness by allowing light to pass through the microlens array while still achieving the desired parallax separation for extended optimal viewing distance.
Solution Approach 2:
The microlens array acts as an intermediary between the display screen and the viewer's eyes. Rather than directly blocking light with a barrier, the microlenses mediate the light path by refracting it to create separate optical paths for left and right eyes. This intermediary approach preserves overall light transmission while achieving stereoscopic separation, thereby maintaining brightness.
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 light collecting unit enhances brightness and allows for an extended optimal viewing distance by refracting light in the open regions of the rear barrier, addressing the limitations of traditional devices while maintaining a slim form factor.
Implementation Method 1
a prism sheet having a low index of refraction disposed below the rear barrier, between the open regions to expose the open regions
Implementation Method 2
a plurality of lenticular lenses covering the open regions formed below the rear barrier and having a low index of refraction
Data Source
AI summary
A stereoscopic image display device including a rear barrier and a parallax unit and thus having highly improved brightness is disclosed. The stereoscopic image display device includes a rear barrier disposed on a bottom surface of a display panel, a parallax unit disposed on a top surface of the display panel, and a light collecting unit disposed between the rear barrier and a backlight unit. Here, the light collecting unit collects light incident from the backlight unit in an open region of the rear barrier to improve brightness of the stereoscopic image display device.