3D Video Display Local Contrast Control via Composite Signal
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Solution Overview
Problem
Conventional 3D video display devices experience extraneous radiation and increased circuit complexity due to high-frequency communications with LED light-emitting diodes, leading to potential noise interference and higher manufacturing costs.
Innovation Solution
A video display device configuration that combines left-eye and right-eye video signals to generate a composite signal, allowing for local contrast control with a reduced number of local control units and lower operating frequency for the light-emitting device drive unit, thereby minimizing extraneous radiation and circuit size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high-frequency communications are used between local control units and LED driver for real-time local contrast control, then image quality and contrast control performance are improved, but extraneous radiation and noise interference increase
Solution Approach 1:
The patent applies periodic action by switching the communication frequency between local control units and LED driver from high-frequency (120Hz) to low-frequency (60Hz) based on the display timing. The LED driver communicates with local control units only during periods when the liquid crystal panel displays images, thereby reducing extraneous radiation while maintaining adequate local contrast control performance.
2Manufacturing precision
If separate local control units are provided for right-eye and left-eye images in time-sharing system, then local contrast control for each eye is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent applies universality by designing local control units that can handle both right-eye and left-eye images through a single unified structure. The local control units receive video signals for either eye and perform local contrast control functions universally, eliminating the need for separate dedicated control units for each eye and thereby reducing device complexity.
Solution Approach 2:
The patent merges the control functions for right-eye and left-eye images into a single integrated control unit. By combining the local contrast control functionality for both eyes within one unit, the patent reduces the overall number of control units required, simplifying the circuit architecture and reducing manufacturing costs while maintaining the ability to provide eye-specific local contrast control.
3Productivity
If LED backlight intensity is switched at high frequency (120Hz) for time-sharing 3D display, then display refresh rate is improved, but noise interference to electronic components increases
Solution Approach 1:
The patent applies periodic action by synchronizing the LED backlight intensity switching with the liquid crystal panel display timing. The LED driver adjusts intensity only during periods when the liquid crystal panel is displaying images (at 60Hz), rather than continuously switching at 120Hz, thereby reducing noise interference to electronic components while maintaining the required display refresh rate.
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 achieves high-quality 3D image local contrast control while reducing extraneous radiation and manufacturing costs by using a composite video signal to determine light-emission intensity, thus enhancing image quality and reducing noise interference.
Implementation Method 1
A liquid crystal display device acting as a video display device illuminates a liquid crystal panel with an LED backlight including an array of light-emitting diodes (LEDs)
Data Source
AI summary
A video display device is provided to achieve local control for a high-quality 3D image while reducing extraneous radiation. A video display device that receives video signals from two video signal lines with an identical frame period and is capable of displaying a stereoscopic image based on left-eye and right-eye images, the video display device including: a liquid crystal drive unit; a liquid crystal panel; an LED backlight that has a plurality of light emission areas; a combination unit that generates a composite video signal by combining the video signals with the identical frame period; a local control unit that detects a video feature quantity such as the intensity value of the composite video signal and determines the light-emission intensity value of the light emission area; and an LED driver.