Stereo Display Backlight Using Orthogonal Spectral Ranges
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Solution Overview
Problem
Existing stereoscopic image reproduction methods face challenges in achieving good color reproduction while being simple and cost-effective, with issues such as color filtering, brightness reduction, and flicker effects in current technologies.
Innovation Solution
The system integrates wavelength-division multiplexing for backlighting and time-division multiplexing of the pixel array control, using orthogonal spectral ranges and filters to separate stereo images, allowing for reliable separation without high costs, and includes compact, low-heat luminous sources and light guides for efficient light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If wavelength-division multiplexing with interference filters is used for stereo image separation, then color reproduction quality is improved, but device complexity and cost increase
Solution Approach 1:
The patent combines wavelength-division multiplexing (spectral separation) with time-division multiplexing (sequential display) to achieve stereo separation. By merging these two approaches, the system uses orthogonal spectral ranges with filters that have reduced spectral overlap, allowing reliable separation while simplifying the overall system architecture and reducing costs compared to using only wavelength-division multiplexing with full interference filters.
Solution Approach 2:
The patent segments the spectral range into orthogonal portions for left and right eye images, with filters designed to have minimal overlap between passbands. This segmentation approach allows each filter to focus on specific spectral regions, improving separation efficiency while reducing the complexity of requiring complete spectral coverage for each eye.
2Stability of the object's composition
If shutter glasses with high refresh rate are used to eliminate flicker, then image stability is improved, but energy consumption and device complexity increase
Solution Approach 1:
The patent employs periodic action by sequentially displaying left and right eye images in alternating time slots at a reduced refresh rate. Combined with wavelength-division multiplexing and orthogonal filters, this periodic display approach eliminates the need for high refresh rates (120-160 Hz) required by traditional shutter glasses, thereby reducing energy consumption while maintaining image stability through the persistent visual effect and spectral separation.
3Use of energy by moving object
If sequential display of stereo images with reduced refresh rate is used, then energy consumption is reduced, but flicker effect increases
Solution Approach 1:
The patent merges wavelength-division multiplexing with time-division multiplexing to enable reduced refresh rate operation without noticeable flicker. The orthogonal filters provide continuous spectral separation that persists across the display interval, allowing the system to lower the refresh rate and reduce energy consumption while the combined approach maintains image stability and eliminates flicker perception.
Solution Approach 2:
The patent introduces orthogonal filters as an intermediary mechanism that maintains visual continuity during the display interval. These filters with reduced spectral overlap act as mediators that preserve image stability and reduce flicker effects even at lower refresh rates, enabling energy-efficient operation without compromising visual quality.
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 approach provides reliable stereo image separation with excellent wearing comfort and mobility, reduced crosstalk, and lower refresh rates, resulting in a cost-effective and high-quality stereoscopic experience with minimal flickering.
Implementation Method 1
two luminous sources (1, 2) with different orthogonal spectral ranges are switched sequentially in a synchronous manner
Implementation Method 2
The different spectral ranges, orthogonal to one another, of the two luminous sources 1, 2 are created by filters 3, 4
Implementation Method 3
The light guide 8 distributes the light from the luminous sources 1, 2 uniformly over the pixel array 5
Data Source
AI summary
A system for reproducing stereographic images is provided that includes a display unit that has a pixel array for representing image data which reproduces the same when controlled with stereoscopic image data, and a light source for fully illuminating the pixel array. The system further includes a pair of glasses that are suitable to make the reproduced stereoscopic image data available to a wearer of the pair of glasses in an eye-selective manner. The display unit has at least one additional light source for fully illuminating the pixel array. Every light source is additionally configured to emit light in a plurality of narrow spectral ranges, thereby defining a color range, the spectral ranges of the light sources being orthogonal to each other. The system also includes a control unit that sequentially operates the light sources. The pair of glasses has optical glasses, spectral transmission ranges of which are orthogonal to each other and correspond to the spectral ranges of the light sources in such a manner as to allow the reproduction of stereographic images in a reliable and cost-effective manner.