Liquid Crystal Display Backlight Timing for 3D Crosstalk Reduction
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Solution Overview
Problem
Current image display devices using liquid crystal shutter glasses suffer from 3D crosstalk and motion blurring due to the response time delay of liquid crystals, which affects the quality of both 2D and 3D image rendering.
Innovation Solution
An image display device with a liquid crystal display panel, panel driving circuits, and a controller that modulates input data to generate synchronized frame data, controls the panel driving circuits to display the same frame data every two consecutive frame periods, and adjusts the backlight timing to improve response time and reduce crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If liquid crystal shutter glasses are used to implement 3D images by alternately displaying left and right eye images, then stereoscopic effect is achieved, but 3D crosstalk occurs due to liquid crystal response time delay
Solution Approach 1:
The patent applies preliminary action by displaying the same frame data twice in consecutive frame periods (first and second frame periods) before switching to different frame data. This preliminary repetition allows the liquid crystal to fully respond to each frame before the next frame is displayed, eliminating crosstalk. The controller is configured to display identical frame data for two consecutive periods, ensuring the liquid crystal has sufficient time to transition between states without carrying over residual images that would cause crosstalk.
2Stability of the object's composition
If liquid crystal display panel maintains previous frame data due to response time, then data stability is maintained, but motion blurring occurs in 2D moving pictures
Solution Approach 1:
The patent uses preliminary action by displaying the same frame data twice in a row (first and second frame periods) before introducing new frame data. This creates a deliberate pause or buffer period that allows the liquid crystal to fully respond to each frame without carrying over residual images. By repeating the frame data for two consecutive periods, the system ensures complete data stabilization while maintaining smooth motion picture playback, effectively resolving the motion blurring issue without sacrificing data stability.
3Productivity
If same frame data is displayed every two consecutive frame periods, then motion picture response time is improved, but backlight control complexity increases
Solution Approach 1:
The patent applies periodic action by establishing a regular, repeating pattern where the same frame data is displayed for two consecutive frame periods, then switched to different frame data. This periodic repetition creates a predictable timing pattern that simplifies backlight control. The controller can systematically manage the backlight by synchronizing it with the frame data display cycles, turning the backlight on and off in a rhythmic pattern that matches the doubled frame rate, thereby reducing control complexity while maintaining improved response time.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution significantly improves the motion picture response time (MPRT) for 2D images and reduces 3D crosstalk, resulting in enhanced display quality for both 2D and 3D images.
Implementation Method 1
liquid crystal display panel configured to selectively implement 2D images and 3D images
Implementation Method 2
binocular parallax images are displayed on a direct view display panel or a projector by changing polarization directions
Data Source
AI summary
An image display device comprises a liquid crystal display panel configured to selectively implement 2D images and 3D images, panel driving circuits configured to drive the liquid crystal display panel, a backlight configured to include a plurality of light sources and supply light to the liquid crystal display panel, and a controller configured to modulate input data to generate frame data synchronized with N (where N is a positive integer equal to or more than 4) multiple frame frequency, control the panel driving circuits such that the same frame data is displayed in the liquid crystal display panel every two consecutive frame periods, control the backlight to be turned off for a former frame period of the two frame periods allocated to display the same frame data, and control the backlight to be turned on for a latter frame period of the two frame periods.