Liquid Crystal Display Panel and Backlight Synchronization
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Solution Overview
Problem
Conventional liquid crystal display devices face issues with video blurring due to asynchronous driving of liquid crystal panels and backlights, which affects display quality for both still images and videos, and existing methods do not effectively combine simultaneous screen driving with scan-backlight driving.
Innovation Solution
A liquid crystal display device configuration where the liquid crystal panel and backlight are divided into groups, with a light controlling circuit managing the regions to synchronize the scanning voltages and video voltages across multiple lines, ensuring that the backlight regions are turned on and off in sync with the scanning lines, improving video properties without compromising still image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional method for driving scan-back light is applied to a method for simultaneously driving two screens, then the liquid crystal panel and the backlight are not driven in sync, but the video properties cannot be improved and the display of still images may deteriorate
Solution Approach 1:
The liquid crystal display panel is divided into two separate panels, with each panel having its own scanning line driving circuit. The backlight is divided into multiple regions that can be independently controlled. This segmentation allows each panel to be driven independently while synchronizing with the corresponding backlight regions, resolving the contradiction between improving video properties and maintaining still image quality.
Solution Approach 2:
The invention implements dynamic control where the backlight regions are turned on and off in synchronization with the scanning lines of the liquid crystal panels. The light controlling circuit dynamically adjusts the backlight timing based on the scanning progress, ensuring that the backlight is active only when needed for each panel's display refresh, thereby achieving sync driving and improving video properties without compromising still image display.
2Ease of operation
If the liquid crystal panel and backlight are driven asynchronously, then the device operation is simpler, but the video properties deteriorate due to video blurring
Solution Approach 1:
By dividing the backlight into multiple independently controllable regions corresponding to different panel sections, the system can control each region's timing separately. This segmentation enables precise synchronization control for video display while maintaining independent control for still images, thus improving video properties without overly complicating the overall driving control.
Solution Approach 2:
The light controlling circuit acts as an intermediary between the scanning line driving circuits and the backlight regions. It receives timing signals from the scanning circuits and controls the backlight regions accordingly, mediating the synchronization between panel scanning and backlight illumination. This intermediary approach enables coordinated control while maintaining relative simplicity in the driving architecture.
Data Source
AI summary
A liquid crystal display device includes a liquid crystal display panel having first and second scanning lines, first and second video lines, a first scanning line driving circuit, a second scanning line driving circuit, at least one first video line driving circuit, at least one second video line driving circuit, a backlight having a number of light sources, and a light controlling circuit for controlling the turning on and off of the backlight. The first scanning lines are divided into M groups where M is an integer of 2 or more (M≧2), the second scanning lines are divided into N groups where N is an integer of 2 or more (N≧2), the region of the backlight which corresponds to the first scanning lines is divided into M regions, and the region which corresponds to the second scanning lines is divided into N regions.