Backlight Block Scanning for Stereoscopic Display Image Mixing

The patent applies periodic action by using time-divisional display method where left and right eye images are displayed alternately at 120 Hz frame frequency. The backlight unit is divided into blocks that are sequentially scanned in periodic intervals, with each block's lighting period synchronized to the alternating frame sequence. This periodic operation at 120 Hz provides sufficient image display speed while avoiding the harmful effects associated with higher frequencies.

The backlight unit is segmented into multiple blocks that are sequentially scanned and lit in different time intervals. Each block's lighting period is controlled independently and is shorter than the addressing period of the liquid crystal panel. This segmentation allows the system to maintain 120 Hz frame frequency without requiring the entire backlight to operate continuously at higher frequencies, thereby reducing heat generation and electromagnetic interference while still achieving fast image display.

The patent applies local quality by making different blocks of the backlight unit have different lighting timing characteristics. Each block's lighting period is locally optimized to be shorter than the addressing period of the liquid crystal panel, ensuring that light is provided during the appropriate time intervals for left and right eye images without overlap. This local control of lighting timing prevents image mixing while maintaining sufficient brightness in each block.

The backlight blocks are activated in periodic sequences synchronized with the time-divisional display of left and right eye images. Each block's lighting period is periodically controlled to coincide with the display of the corresponding eye's image data, ensuring that illumination is provided when needed without extending into the time interval of the other eye's image, thus preventing image mixing while maintaining brightness.

The backlight unit is divided into multiple blocks that can be scanned sequentially at high speed. By segmenting the backlight into discrete blocks, the system can rapidly switch between blocks without requiring each block to be illuminated for a long duration. The segmentation allows the scanning to proceed quickly through all blocks while each block receives sufficient light during its designated time interval, maintaining both high refresh rate and adequate illumination.

The backlight blocks are illuminated in periodic sequences where each block receives a concentrated pulse of light during its specific time interval. This periodic illumination pattern allows the scanning to move quickly from block to block while ensuring that each block receives sufficient light output during its active period. The periodic nature of the illumination ensures that the total light output is adequate even though individual block illumination times are short.