Liquid Crystal Display Backlight Control for 3D Crosstalk Reduction
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Solution Overview
Problem
Current image display devices using liquid crystal display panels suffer from 3D crosstalk and motion blurring, particularly when switching between left and right eye images, due to the response time delay of liquid crystals, which affects the quality of both 3D and 2D image rendering.
Innovation Solution
An image display device with a liquid crystal display panel, panel driving circuits, a backlight with multiple light source blocks, and a controller that synchronizes image data and light source control to ensure the same image data is displayed across multiple frame periods, with specific light source scanning and blinking periods to minimize crosstalk and improve response time, using data interpolation and doubling for 2D images and data division and doubling for 3D images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If liquid crystal display panel is used to implement 3D images by temporal division, then stereoscopic effect is achieved, but 3D crosstalk occurs due to response time delay
Solution Approach 1:
The backlight is divided into multiple light source blocks that can be independently controlled and sequentially turned on. This segmentation allows the patent to illuminate different portions of the display at different times, synchronizing with the liquid crystal response to eliminate crosstalk between left and right eye images while maintaining 3D capability.
Solution Approach 2:
The patent employs periodic switching of light source blocks in synchronization with the liquid crystal response time. By turning on specific light source blocks at specific frame periods (e.g., blocking backlight during transition periods), the system achieves clear 3D images without crosstalk through periodic control actions.
2Stability of the object's composition
If liquid crystal maintains previous frame data due to response time, then image continuity is maintained, but motion blurring occurs in 2D moving pictures
Solution Approach 1:
The patent uses periodic backlight switching to clear residual image data from the liquid crystal between frames. By turning off the backlight during transition periods and selectively illuminating during stable display periods, motion blurring is reduced while maintaining image continuity during the illuminated phases.
Solution Approach 2:
The patent maintains continuous useful action by ensuring the backlight is always illuminating during periods when the liquid crystal displays stable image data, while temporarily blocking during transition periods. This creates continuous useful illumination without the harmful effects of motion blurring.
3Speed
If frame frequency is increased to reduce motion blurring, then response time improves, but power consumption increases
Solution Approach 1:
Instead of increasing overall frame frequency, the patent segments the backlight into multiple controllable blocks and selectively activates them based on the display content and timing. This reduces average power consumption while maintaining the perception of high refresh rates during critical display periods.
Solution Approach 2:
The patent employs periodic backlight switching at optimized frequencies that reduce motion blurring without requiring continuous high-frequency operation. By blocking the backlight during transition periods and illuminating during stable periods, the system achieves improved response characteristics with lower average power consumption.
Data Source
AI summary
An image display device comprises a liquid crystal display panel, panel driving circuits, a backlight configured to include a plurality of light source blocks, and a controller configured to modulate input data to generate image data synchronized with N multiple frame frequency, control the panel driving circuits such that same image data are displayed every two consecutive frame periods, control the light source blocks to be sequentially turned on during a light source scanning period, and control the light source blocks to be simultaneously turned off during a light source blinking period between neighboring light source scanning periods.