3D Display Apparatus Shutter Control for Flicker Reduction
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Solution Overview
Problem
In 3D video image display systems using the time-division method, viewers struggle to determine if the content is 3D when they start watching after the broadcast has begun, and existing solutions like passive and active stereo methods face issues such as image quality degradation, high costs, and eye fatigue due to flicker phenomena.
Innovation Solution
An image display apparatus that adds an additional information image frame between left and right eye frames, controlling shutters to ensure only the additional information frame is not visible to observers wearing 3D glasses, while non-wearers can see prompts to wear glasses, using a control signal to manage shutter states for effective 3D content display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the time-division method is used to display 3D video images, then stereovision is achieved through frame switching, but a flicker phenomenon occurs causing eye and brain fatigue
Solution Approach 1:
The patent applies periodic action by using a flash lamp that synchronizes with the frame switching of the display apparatus. The flash lamp emits light periodically at the same frequency as the frame rate, illuminating only during the display of each frame. This periodic illumination eliminates the flicker phenomenon because the human eye perceives the rapid succession of illuminated frames as continuous light, while still achieving the time-division separation of left and right eye images for stereovision.
2Loss of information
If additional information is displayed on the screen for non-3D viewers, then they can see prompts to wear glasses, but viewers wearing 3D glasses also see this information which disrupts their experience
Solution Approach 1:
The patent segments the display content into two distinct parts: a 3D video image portion and an additional information portion. The 3D portion is displayed during time periods when the flash lamp is active and synchronized with frame switching, making it visible only to viewers wearing shutter glasses. The additional information portion is displayed during time periods when the flash lamp is inactive, making it visible only to non-wearers. This temporal segmentation allows both types of information to coexist without interference.
Solution Approach 2:
The patent uses periodic action by alternately displaying the 3D video image and additional information at different time periods within each frame cycle. The flash lamp synchronizes with this periodic display, illuminating only during the 3D portion. This creates a rhythmic pattern where wearers see 3D content during illuminated periods and non-wearers see additional information during dark periods, effectively separating the information delivery to different viewer groups.
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
Enables clear differentiation between 3D content and additional information, reducing eye fatigue and costs by ensuring only intended viewers see 3D images, while non-viewers are prompted to wear glasses, thus enhancing the viewing experience and system efficiency.
Implementation Method 1
a flash lamp synchronized with a frame switching timing of the image display apparatus
Data Source
AI summary
A normal three-dimensional image is presented to a person who is wearing glasses for three-dimensional image observation, and additional information including a message, disturbance information, or the like is presented to a person who is not wearing glasses for three-dimensional image observation. An image display apparatus displays, on a display unit, an image frame sequence in which additional information image frame including additional information is added between an image frame for the left eye and an image frame for the right eye. At a display timing of the additional information image frame for the display unit, the image display apparatus outputs a control signal that sets shutters for both the left and right eyes of glasses for three-dimensional image observation worn by an observer to a closed state. With this configuration, an observer who is wearing glasses for three-dimensional image observation can observe a normal three-dimensional image, and a person who is not wearing the glasses can observe additional information such as a message prompting the person to wear the glasses.