3D Display Backlight Control via Vertical Blanking Intervals
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Solution Overview
Problem
Conventional 3D stereo image display systems have low light-emitting efficiency due to short viewing times during vertical blanking intervals and require complex voltage triggering mechanisms for accurate shielding of 3D glasses, leading to incomplete image display during image frame updating intervals.
Innovation Solution
A control apparatus that includes an image processor converting image signals into timing intervals, a backlight control apparatus generating signals for the backlight to be on only during vertical blanking intervals, and a pair of 3D glasses with shields turned off only during these intervals, allowing complete image frames to be displayed during updating intervals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the backlight is always turned on during image frame updating intervals, then the display is continuous, but incomplete images are displayed causing poor image quality
Solution Approach 1:
The backlight operates periodically by turning on only during vertical blanking intervals when complete image frames are displayed, and turning off during image frame updating intervals. This periodic operation ensures that viewers only see complete images while improving light-emitting efficiency by eliminating wasted backlight illumination during updates.
2Productivity
If the backlight is turned on only during vertical blanking intervals, then light-emitting efficiency increases, but viewing time decreases
Solution Approach 1:
By utilizing the vertical blanking intervals which occur continuously during the display refresh cycle, the backlight maintains continuous useful illumination during these intervals. Although the backlight is off during updating intervals, the cumulative viewing time during VBI intervals provides sufficient continuous perception of complete images to maintain effective viewing experience.
3Measurement precision
If complex voltage triggering mechanisms are used for accurate shielding of 3D glasses, then shielding precision improves, but device complexity increases
Solution Approach 1:
The patent extracts and eliminates the complex voltage triggering mechanism from the 3D glasses control system. By using simple on/off control signals synchronized with the backlight timing, the system achieves accurate shielding coordination without requiring complex voltage triggering circuits, thereby reducing device complexity while maintaining shielding precision.
Data Source
AI summary
A control apparatus for controlling a three-dimensional (3D) display apparatus includes: an image processing unit to receive an image source signal and convert the image source signal to an interval signal. The interval signal is defined as a first timing interval and a second timing interval. A backlight control device, coupled to the image processing unit, receives the interval signal and generates a plurality of backlight control signals according to the interval signal. A backlight device, coupled to the backlight control device, receives the plurality of backlight control signals and provides a lighting source to a display device during the first timing interval and/or the second timing interval according to the plurality of backlight control signals.