Liquid Crystal Display Driving Method for Frame Isolation
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Solution Overview
Problem
The insertion of a black display period in liquid crystal display devices with synchronous-type planar light source devices reduces the timing margin in scan periods, leading to shorter frame periods and increased power consumption, particularly when displaying 3D images or high-frame-rate content.
Innovation Solution
A liquid crystal display and driving method that divides the display region into multiple units, allowing each planar light source unit to remain luminous for a predetermined period after a line-sequential scan, with wait times set to maximize the luminous period of the first scanned unit and minimize the last scanned unit, and decreasing wait times for units in between, ensuring non-overlapping luminous periods and extended scan periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a black display period is inserted between video display periods to isolate frame images, then moving image display characteristics are improved, but the scan period becomes shorter and timing margin is reduced
Solution Approach 1:
The display region is divided into multiple display region units (first, second, third, fourth units) that are scanned in sequence. The scan period is segmented into distinct phases: scanning the first display region unit during the first video display period, scanning the second display region unit during the black display period, and scanning the third and fourth display region units during the second video display period. This segmentation allows the scan to continue throughout the entire frame period including the black display period, thereby maintaining adequate timing margin while still providing frame isolation.
2Reliability
If a black display period is inserted to isolate frame images, then moving picture display performance is enhanced, but power consumption increases due to shorter frame periods
Solution Approach 1:
The display region is divided into multiple display region units that are scanned sequentially. The scan period is extended to cover the entire frame period by utilizing the black display period for scanning the second display region unit. This segmentation strategy maintains the frame isolation benefit while preventing excessive power consumption by avoiding the need to compress all scanning into shorter intervals.
3Reliability
If the scan period is shortened to accommodate a black display period, then frame image isolation is achieved, but timing margin in scan is reduced
Solution Approach 1:
The scan period is divided into multiple segments corresponding to different display region units. The first display region unit is scanned during the first video display period, the second display region unit is scanned during the black display period, and the third and fourth display region units are scanned during the second video display period. This segmentation allows frame image isolation to be achieved while maintaining adequate timing margin by distributing the scanning workload across the entire frame period.
Solution Approach 2:
The liquid crystal display device is scanned in advance during the black display period (when no light is emitted) to prepare the display region units for the subsequent video display period. This preliminary scanning action during the black display period allows the system to maintain timing margin while achieving frame isolation, as the scanning occurs when visual output is not required.
Data Source
AI summary
A liquid crystal display includes: a transmissive liquid crystal display device having a display region made up of pixels arrayed in a matrix fashion. The liquid crystal display device includes a planar light source unit formed of planar light source units corresponding to respective display region units on an assumption that the display region is divided into the display region units and configured in such a manner that each planar light source unit irradiates a corresponding display region unit with light, and a drive circuit driving the liquid crystal display device and the planar light source device. The liquid crystal display device is scanned line-sequentially and the pixels making up each display region unit are scanned line-sequentially. A planar light source unit corresponding to a display region unit is held in a luminous state over a predetermined period since a line-sequential scan on the display region unit has been completed.