Cascade Driver Circuits for Display Devices
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Solution Overview
Problem
Existing active-matrix display devices face issues with increased heat generation, power consumption, and electromagnetic interference (EMI) due to the cascade connection of image signal line driver circuits, which are not adequately addressed by previous configurations.
Innovation Solution
The display device groups image signal line driver circuits into cascaded groups, with each group receiving data signals from a display control circuit, where the first-stage driver circuit provides only a portion of the data to subsequent drivers, and the amplitude and phase of signals are adjusted based on transmission loss and interference considerations, allowing for efficient data transmission and heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If image signals are transmitted between cascade-connected driver circuits, then a large number of image signal line driver circuits can be formed using a small number of signal lines, but heat generation and power consumption increase
Solution Approach 1:
The patent divides the transmission of image signals into segments by introducing signal lines with different functions (first image signal lines and second image signal lines) that carry different portions of the signal data. This segmentation allows the driver circuits to process and transmit only the necessary portions of signals at different stages, reducing the total energy consumption while maintaining the cascade connection architecture.
Solution Approach 2:
The patent applies local quality by differentiating between various signal lines (first image signal lines vs. second image signal lines) based on their specific functions and transmission characteristics. Each type of signal line is optimized for its particular role in the cascade connection, allowing for reduced power consumption in specific segments while maintaining overall system functionality.
2Device complexity
If image signals are transmitted between cascade-connected driver circuits, then a large number of image signal line driver circuits can be formed using a small number of signal lines, but electromagnetic interference increases
Solution Approach 1:
The patent segments the signal transmission into different paths (first image signal lines and second image signal lines) that carry different portions of the signal data. This segmentation spatially separates the signal transmission paths, reducing electromagnetic interference between adjacent driver circuits while maintaining the cascade connection structure.
Solution Approach 2:
The patent introduces intermediary signal lines (second image signal lines) that act as mediators between the first image signal lines and the subsequent driver circuits. These intermediary lines facilitate signal transmission while providing electrical isolation and reducing direct electromagnetic coupling between adjacent circuits in the cascade connection.
3Loss of information
If all image signals are transmitted between cascade-connected driver circuits, then complete data transmission is achieved, but heat generation increases
Solution Approach 1:
The patent applies partial action by having each driver circuit transmit only the necessary portions of image signals to subsequent circuits in the cascade connection. The first image signal lines transmit initial signal portions, and the second image signal lines transmit remaining portions, ensuring complete data transmission while minimizing the total signal energy and heat generation across all circuits.
Data Source
AI summary
An image signal line driver circuit includes first to third source drivers and fourth to sixth source drivers, which are respectively cascade-connected. The output duration of data signals that are provide to these source drivers is increasingly short on the source drivers that are connected further downstream (that is, the amount of pixel data to be output to the next stage is increasingly small). This reduces the power consumption and heat generation of the overall device. Moreover, the phases of the data signals are shifted, thereby reducing EMI. In this way, when a plurality of image signal line driver circuits are cascade-connected, heat generation and power consumption in each driver circuit and/or EMI therebetween is reduced.