Video Display Apparatus Crosstalk Reduction
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Solution Overview
Problem
Existing 3D video display systems using liquid-crystal projectors face issues with crosstalk and transverse-direction electric fields, which degrade image quality by causing unintended interactions between pixels.
Innovation Solution
A video display apparatus that divides each frame into subframes using step bit pulses and alternates between two drive gradation tables to manage pixel activation states, reducing crosstalk and transverse electric fields by adjusting the timing of pixel activation based on gradation changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If every frame is divided into multiple subframes with increased number of active subframes as gradation value rises, then crosstalk is suppressed, but transverse-direction electric fields occur between pixels
Solution Approach 1:
The patent applies dynamics by making the drive gradation table switchable based on frame type. The system dynamically selects between a first drive gradation table (for normal frames) and a second drive gradation table (for interpolated frames) depending on the temporal differentiation between current and previous frames. This dynamic adaptation allows the system to optimize between crosstalk suppression and transverse electric field prevention in different operating conditions.
Solution Approach 2:
The patent changes the parameter of drive gradation table configuration based on frame type. When temporal differentiation is high, the system uses one configuration; when temporal differentiation is low, it switches to another configuration. This parameter change approach allows the system to adapt the subframe activation pattern to current display conditions, preventing transverse electric fields while maintaining crosstalk suppression.
2Reliability
If frame rate is increased to reduce crosstalk, then image quality improves, but transverse electric fields between pixels increase
Solution Approach 1:
The system dynamically adjusts the drive approach based on temporal frame differentiation. Instead of using a fixed high frame rate approach, the system switches between different drive gradation tables depending on whether the current frame is temporally similar to or different from the previous frame. This dynamic adjustment reduces unnecessary transverse electric fields while maintaining crosstalk suppression.
Solution Approach 2:
The patent changes the operational parameters by selecting different drive gradation tables based on frame type. For interpolated frames with low temporal differentiation, a different table configuration is used that reduces transverse electric field generation while maintaining the subframe-based crosstalk suppression mechanism.
3Measurement precision
If a single drive gradation table is used to suppress crosstalk, then image clarity improves, but transverse electric fields deteriorate image quality
Solution Approach 1:
The patent implements dynamics by making the drive gradation table selection dependent on frame type and temporal differentiation. The system switches between a first drive gradation table and a second drive gradation table based on whether the current frame is an original or interpolated frame. This dynamic selection maintains image clarity through consistent crosstalk suppression while preventing transverse electric fields through appropriate table selection.
Solution Approach 2:
The system changes the drive gradation table parameters based on frame type. By detecting temporal differentiation between frames, the system selects appropriate parameters from different drive gradation tables, optimizing the balance between image clarity and transverse electric field prevention for each specific frame condition.
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 effectively reduces crosstalk and minimizes the detrimental effects of transverse electric fields on image quality, providing clearer and more accurate stereoscopic images by optimizing pixel activation timing and gradation management.
Implementation Method 1
a liquid-crystal display device
Implementation Method 2
transverse-direction electric fields (lateral electric fields) occur between pixels of a liquid-crystal device
Data Source
AI summary
Every frame regarding an input video signal is changed into a sequence of subframes. Subframe data is generated from the input video signal while first and second tables are alternately used. The first and second tables are designed so that a number of subframes assigned a pixel activated state increases each time a drive gradation related to the input video signal increases by 1. According to the first table, a subframe newly assigned the pixel activated state is one following the subframe or subframes which have already been assigned the pixel activated state when the drive gradation increases from an odd number to a next even number. According to the second table, a subframe newly assigned the pixel activated state is one preceding the pixel-activated-state subframe or subframes in that case. A display device is driven in response to the generated subframe data.