3D Display Backlight with Alternating Line Sources
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing 3-dimensional displaying apparatuses using parallax barrier plates or lenticular lens sheets suffer from crosstalk, pseudo-stereoscopic vision, and non-uniform brightness when the observer's horizontal location changes, leading to suboptimal stereoscopic image rendering.
Innovation Solution
A 3-dimensional displaying apparatus with a backlight panel featuring line sources arranged at regular intervals, where each line source's width is less than 30% of the pixel pitch, and a pupil tracking unit to alternately drive multiple line source sets based on the observer's location, ensuring uniform brightness and minimizing crosstalk between visual fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a parallax barrier plate or lenticular lens sheet is used to separate visual fields, then 3-dimensional stereoscopic images can be displayed, but crosstalk occurs between adjacent visual fields when the observer's horizontal location changes
Solution Approach 1:
The visual field separation is achieved by segmenting the backlight into multiple line sources that correspond to different visual fields. Each line source emits light in a specific direction to illuminate pixels for a particular visual field, thereby preventing crosstalk between adjacent visual fields while maintaining 3D stereoscopic display capability.
Solution Approach 2:
Different regions of the display (corresponding to different visual fields) are illuminated by dedicated line sources with specific emission characteristics. This local quality approach ensures that each visual field receives light only from its corresponding line source, eliminating crosstalk while preserving stereoscopic image quality.
2Adaptability or versatility
If the observer moves horizontally, then the viewing area increases, but pseudo-stereoscopic vision occurs due to incorrect image information being displayed to each eye
Solution Approach 1:
The system dynamically adjusts which line sources are activated based on the observer's horizontal position. By tracking or estimating the observer's location, the control unit selectively drives appropriate line sources to ensure that correct image information is always displayed to each eye, preventing pseudo-stereoscopic vision while allowing horizontal movement flexibility.
Solution Approach 2:
The system uses feedback regarding the observer's horizontal location to control which line sources are driven. This feedback mechanism ensures that the displayed image information remains accurate for stereoscopic perception even when the observer moves horizontally, thereby maintaining reliability while improving adaptability.
3Adaptability or versatility
If multiple line source sets are driven simultaneously to cover a wider viewing area, then horizontal viewing flexibility increases, but brightness uniformity deteriorates
Solution Approach 1:
Instead of driving all line sources continuously, the system employs periodic or selective activation of line source sets based on the observer's horizontal position. This approach ensures that only the necessary line sources are active at any given time, maintaining bright uniformity in the observed visual field while still providing horizontal viewing flexibility through dynamic switching.
4Illumination intensity
If the line source width is increased to improve light output, then illumination intensity increases, but crosstalk between adjacent visual fields worsens
Solution Approach 1:
The backlight is segmented into multiple narrow line sources, each dedicated to a specific visual field. This segmentation allows each line source to have sufficient brightness for its designated field while preventing light spill into adjacent fields, thereby resolving the contradiction between light output and crosstalk prevention.
Solution Approach 2:
Each line source is optimized for its specific local function of illuminating a particular visual field. By concentrating light output locally rather than using broad, wide line sources, the system achieves adequate illumination intensity while maintaining sharp visual field boundaries that prevent crosstalk.
Data Source
AI summary
A 3-dimensional displaying apparatus includes an image displaying panel having a plurality of pixels and a backlight panel spaced apart from one surface of the image displaying panel. The backlight panel includes a first line source set having a plurality of line sources arranged at regular intervals and a second line source set having line sources arranged spaced apart from the respective line sources of the first line source set by a predetermined interval. The first line source set and the second line source set are driven alternately. Thus, in a case where a horizontal location of an observer varies, the change of brightness of image information and the crosstalk between adjacent visual fields are minimized, and pseudo-stereoscopic vision is prevented. Also, the irregularity of brightness distribution in a visual field may be solved.