Liquid Crystal Display Switch Circuit Reduces Polarity Reversals
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Solution Overview
Problem
The existing liquid crystal display devices face challenges in balancing image quality enhancement and power consumption reduction, particularly with the dot inversion drive method, which increases power consumption and heating in the driver IC, and is undesirable for portable electronic instruments operated on batteries.
Innovation Solution
The proposed liquid crystal display device employs a configuration with a switch circuit that reduces the number of video signal input terminals, using a switch circuit with multiple switch elements and switching wires to distribute video signals across fewer input terminals, optimizing the connection of TFT elements and video signal lines to minimize polarity reversals and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If dot inversion drive is employed to improve moving image display performance, then image quality is improved, but power consumption of the driver IC increases and heating value increases
Solution Approach 1:
The invention divides the video signal lines into multiple groups (first group and second group) and assigns them to different input terminals. By segmenting the signal distribution, the system can control polarity reversals independently for each group, reducing the frequency of polarity reversals at any single input terminal while maintaining dot inversion drive benefits for image quality.
Solution Approach 2:
The invention dynamically assigns different video signal lines to different input terminals based on their group assignments. This dynamic allocation allows the system to optimize polarity reversal patterns, ensuring that each input terminal experiences fewer polarity reversals while the overall system maintains the dot inversion drive capability needed for high-quality moving image display.
2Illumination intensity
If dot inversion drive is employed to improve moving image display performance, then image quality is improved, but heating value of the driver IC increases
Solution Approach 1:
By segmenting video signal lines into different groups assigned to different input terminals, the invention reduces the frequency of polarity reversals at each terminal. This segmentation directly reduces the power consumption and heat generation in the driver IC, while preserving the dot inversion drive functionality needed for high-quality image display.
Solution Approach 2:
The invention converts the potentially harmful effect of frequent polarity reversals (which cause heating) into a beneficial control mechanism. By strategically assigning signal lines to different terminals and controlling when polarity reversals occur, the system transforms what would be a source of heat into a controlled parameter that maintains image quality while minimizing thermal impact.
3Device complexity
If the number of video signal input terminals is reduced using a switch circuit, then device complexity is reduced, but the frequency of polarity reversals increases
Solution Approach 1:
The invention segments video signal lines into multiple groups (first group connected to first input terminal, second group connected to second input terminal). This segmentation allows the switch circuit to manage polarity reversals more efficiently by distributing the reversal burden across multiple terminals, reducing the overall frequency of polarity reversals while maintaining a reduced number of input terminals.
Solution Approach 2:
The switch circuit acts as an intermediary between the reduced set of input terminals and the multiple video signal lines. By introducing this intermediary layer with specific switching patterns, the system can maintain terminal reduction benefits while controlling polarity reversal frequency through coordinated switching of different signal line groups.
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
This configuration effectively balances improved image quality with reduced power consumption, minimizing the frequency of polarity reversals and thus lowering the heating and operational costs of the driver IC, making it suitable for battery-operated portable electronic instruments.
Implementation Method 1
the luminance (gradation) of each pixel is controlled by changing the orientation of liquid crystal molecules in the liquid crystal material by means of an electric field whose intensity varies depending on a potential difference between the pixel electrode and common electrode
Implementation Method 2
a deterioration in image quality is prevented by, for example, reversing a relationship in each pixel between the potential of the pixel electrode and the potential of the common electrode for each frame period
Data Source
AI summary
A liquid crystal display device includes plural video signal lines, plural video signal input terminals less in number than the video signal lines, and a switch circuit interposed between the video signal input terminals and the video signal lines. The switch circuit has plural switch elements and plural switching wires, wherein each of the video signal lines is connected to one of the video signal input terminals via one of the switch elements, and each of the video signal input terminals is connected to a plurality of the video signal lines. Further, switching wires, to which are connected the switch elements connected one to each of the plural video signal lines, differ from one another.