Shutter Glasses Timing Control for 3D Display Luminance
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Solution Overview
Problem
Shutter glasses type stereoscopic image displays suffer from reduced luminance in 3D mode due to liquid crystal response delays, leading to incomplete isolation of left and right images, resulting in 3D crosstalk.
Innovation Solution
A stereoscopic image display system that includes a display panel, a backlight unit, and shutter glasses with electrically controlled shutters, where the backlight is turned on during vertical blanking intervals and the shutters are alternately opened and closed to improve luminance and prevent crosstalk by controlling the light sources and shutter operations based on specific timing signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the shutter glasses are driven only during vertical blanking intervals, then the left and right images can be isolated, but the luminance of 3D mode is reduced to approximately 1/10 of 2D mode due to liquid crystal response delay
Solution Approach 1:
The patent applies preliminary action by opening the shutters before the vertical blanking interval starts and keeping them open during the data addressing period. This anticipatory timing compensates for the liquid crystal response delay, ensuring shutters are fully open before light emission and remain open throughout the useful light period, thereby maximizing luminance while maintaining image isolation.
Solution Approach 2:
The patent implements dynamic timing control where shutter operation is adapted to different frame periods. During odd frame periods, the left shutter is opened early and kept open; during even frame periods, the right shutter is opened early and kept open. This dynamic adjustment optimizes luminance for each eye's viewing window while preventing crosstalk.
2Illumination intensity
If the shutter response time is extended to improve luminance, then more light can be transmitted, but 3D crosstalk is generated due to incomplete isolation of left and right images
Solution Approach 1:
The patent uses preliminary action by opening shutters before the vertical blanking interval, ensuring they are fully open during the data addressing period when light is emitted. This timing strategy maximizes luminance transmission without extending the total response time, thereby preventing crosstalk while improving brightness.
Solution Approach 2:
The patent maintains continuous useful action by keeping shutters open throughout the entire data addressing period, not just during the vertical blanking interval. This continuous openness ensures maximum light transmission for the useful image display period while the timing controller ensures shutters close before the opposite eye's image is displayed, preventing crosstalk.
3Illumination intensity
If the vertical blanking interval is extended to allow complete shutter response, then luminance can be improved, but the data addressing period is reduced
Solution Approach 1:
The patent applies preliminary action by opening shutters before the vertical blanking interval begins, during the data addressing period. This allows the shutter response to complete during the data addressing period rather than requiring an extended vertical blanking interval, thus improving luminance without reducing data addressing time.
Solution Approach 2:
The patent uses dynamic timing control to shift shutter operation into the data addressing period. By opening shutters early in the data addressing period and keeping them open throughout, the system maximizes light transmission without requiring a longer vertical blanking interval, thereby preserving data addressing time while improving luminance.
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 system enhances 3D mode luminance and reduces 3D crosstalk by ensuring proper timing of backlight and shutter operations, maintaining high image quality while minimizing bleed between left and right eye images.
Implementation Method 1
a display element DIS selected from a liquid crystal display element, and a backlight unit configured to provide light to the display element DIS
Implementation Method 2
a rising response delay TR of liquid crystals of the shutter glasses. Further, 3D crosstalk may be generated because of a falling response delay TF of the liquid crystals of the shutter glasses
Data Source
AI summary
A stereoscopic image display and a method for driving the same are disclosed. The stereoscopic image display includes a display panel that displays a 2D image data in a 2D mode and displays a 3D image data in a 3D mode, a backlight unit providing light to the display panel, a timing controller that supplies a left eye image data during a data addressing period of a (2N−1)th frame period and supplies a right eye image data during a data addressing period of a 2Nth frame period in the 3D mode, where N is a natural number, and a backlight controller generating a backlight control signal for controlling light sources of the backlight unit so that the light sources of the backlight unit are turned on during a vertical blanking interval of each of the (2N−1)th frame period and the 2Nth frame period in the 3D mode.