Stereoscopic Display Luminance Unevenness Control
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Solution Overview
Problem
Conventional methods for displaying stereoscopic video using electronic shutters result in luminance unevenness across the screen due to the response time of the shutters, causing the lower side of the video display unit to appear darkened and reducing overall video quality.
Innovation Solution
A video display system that includes a display apparatus with a scanning line drive circuit and a data line drive circuit, along with a control unit that manages the timing of video signals and shutter opening/closing, ensuring both shutters are closed during the switching period, thereby equalizing luminance across the screen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the shutter switches in synchronization with the video frame timing, then the stereoscopic video display function is achieved, but luminance unevenness occurs in the upper and lower sides of the display unit
Solution Approach 1:
The shutter switching timing is adjusted in advance to account for the response time delay. The shutter starts closing before the video signal changes, ensuring complete shutter transition before the next frame is displayed. This preliminary action compensates for the response time and prevents luminance unevenness while maintaining the stereoscopic display function.
Solution Approach 2:
The shutter switching timing parameter is modified based on the response time characteristics. By changing the timing parameter to start shutter closure earlier and account for the response delay, the system maintains proper synchronization while eliminating the luminance unevenness problem in the display.
2Reliability
If the shutter response time is accounted for by starting closure in the middle of the video, then complete shutter switching is achieved, but the video display time is reduced and luminance unevenness occurs
Solution Approach 1:
The shutter closure is initiated in advance before the video signal changes, using the response time information to calculate the optimal start time. This ensures the shutter completes switching within the available time while maximizing the video display duration, resolving the contradiction between reliable shutter switching and sufficient display time.
3Illumination intensity
If the shutter switching timing is adjusted to compensate for response time, then luminance unevenness is reduced, but the complexity of timing control increases
Solution Approach 1:
The system uses feedback from the shutter response time characteristics to adjust the switching timing. By monitoring or pre-characterizing the response time and using this information to calculate appropriate closure start times, the system achieves uniform luminance while managing timing control complexity through feedback-based adjustment.
Data Source
AI summary
A video display apparatus includes pixels arranged in lines, a scanning signal transferor that supplies scanning signals to the pixels, and a data signal transferor that supplies a video signal to the pixels. A first controller supplies the video signal to the data signal transferor and causes the scanning signal transferor to supply a first scanning signal that corresponds to a first picture to the lines in the display from a head line to a final line and a second scanning signal that corresponds to a second picture subsequent to the first picture to the lines in the display from the final line to the head line.