3D Display Crosstalk Reduction via LED Backlight Control
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Solution Overview
Problem
Current 3D display technologies for LCDs face issues with crosstalk between left-eye and right-eye images, leading to degraded or impossible 3D perception, and are costly due to the need for expensive optical screens or polarizing retarders.
Innovation Solution
A method involving frequency multiplication of 3D video signals and controlled LED driving signals to alternately display left-eye and right-eye images, with optional insertion of black frames, to reduce crosstalk and power consumption, and simplify the technology by eliminating the need for expensive optical components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polarization-based glasses type uses a polarizing retarder attached to the surface of the LCD screen, then left-eye/right-eye separation is achieved, but processing difficulty and cost increase significantly
Solution Approach 1:
The patent extracts the polarizing retarder from the system entirely, replacing it with a time-division multiplexing approach using LED backlight control. Instead of using optical components to separate left and right eye images, the system uses temporal separation with synchronized shutter glasses, eliminating the complex polarizing retarder attachment process while maintaining effective left-eye/right-eye separation.
Solution Approach 2:
The patent replaces the optical mechanism (polarizing retarder) with an electrical control mechanism (LED driving signals and synchronized shutter control). The mechanical/optical system of attaching and aligning polarizing films is substituted with an electrical timing system that controls LED backlight illumination in sync with shutter glass activation, simplifying manufacturing while achieving the same separation function.
2Reliability
If a polarization-based glasses type uses a polarizing retarder attached to the surface of the LCD screen, then left-eye/right-eye separation is achieved, but cost increases due to expensive film attachment
Solution Approach 1:
The patent removes the expensive polarizing retarder film from the manufacturing process entirely. Instead of purchasing and attaching specialized optical films to each LCD screen, the system uses standard LCD technology combined with LED backlight control and shutter glasses, dramatically reducing material costs while maintaining the core 3D separation functionality.
Solution Approach 2:
The patent replaces the expensive, permanent polarizing retarder film with a more economical approach using disposable shutter glasses for each user. The cost is shifted from expensive screen modifications to affordable user-side accessories, making the overall system more manufacturable and scalable.
3Ease of operation
If LCD display continuously illuminates the screen, then image display is maintained, but power consumption increases and crosstalk occurs between frames
Solution Approach 1:
The patent implements periodic illumination of the LCD backlight, turning it on and off in synchronization with the display of left and right eye frames. The LED backlight is activated only when the corresponding eye's shutter is open, creating a periodic on/off pattern that reduces overall power consumption while preventing crosstalk between frames by ensuring the backlight is off when the wrong eye should be viewing.
Solution Approach 2:
The patent maintains continuous useful action by ensuring the backlight is always on when needed for viewing, eliminating wasted illumination. The synchronized control of LED backlight and shutter glasses ensures that light is produced continuously during the brief moments when it serves a purpose (when the corresponding shutter is open), maximizing efficiency while maintaining image display quality.
4Ease of operation
If LCD display continuously illuminates the screen, then image display is maintained, but crosstalk occurs between left-eye and right-eye images
Solution Approach 1:
The patent uses periodic backlight illumination synchronized with shutter timing to eliminate crosstalk. The LED backlight turns off during the display of alternating frames, ensuring that only the intended eye receives light during each time slot. This temporal separation prevents the persistence of vision effect that causes crosstalk in continuously illuminated displays.
Solution Approach 2:
The patent applies preliminary anti-action by turning off the backlight in advance before switching between left and right eye frames. The synchronized shutter control and LED dimming/pre-charging circuitry prepare the system to prevent crosstalk before it can occur, actively counteracting the potential harmful effect of frame persistence rather than merely reacting to it.
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 effectively eliminates crosstalk, reduces power consumption by nearly 50%, and lowers overall costs by avoiding the use of expensive optical screens or retarders, thereby enhancing 3D perception and simplifying the technology.
Implementation Method 1
driving, by light-emitting diode (LED) driving signals, a panel to display the n consecutive frames of the left-eye signal and the n consecutive frames of the right-eye signal
Data Source
AI summary
A method for displaying 3D image is provided in the present invention. The method includes: 3D image signals, which comprise consecutive one frame of left-eye signal and one frame of right-eye signal, are received; the 3D image signals are processed by frequency multiplication, and n consecutive frames of left-eye signals and n consecutive frames of right-eye signals are obtained, n being the times number of the frequency multiplication and equal to or greater than 2; light-emitting diode (LED) driving signals drive the LED to display the n consecutive frames of left-eye signals and the n consecutive frames of right-eye signals; in the n consecutive frames of left-eye signals, the first frame of left-eye signal corresponds to an LED driving signal which is off, the nth frame of left-eye signal corresponds to an LED driving signal which is on, and in the n consecutive frames of right-eye signals, the first frame of right-eye signal corresponds to an LED driving signal which is off, the nth frame of right-eye signal corresponds to an LED driving signal which is on. The present invention also provides a TV set for displaying 3D image and a pair of glasses for viewing 3D image. By the present invention, the problem of crosstalk between leftimage and rightimage is solved, and backlight sources energy consumption and complete apparatus cost are reduced.