Data Line Driving Circuit with Switchable Bias Control
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Solution Overview
Problem
Existing data line driving circuits for flat panel displays face challenges in efficiently switching output numbers and stopping unnecessary electric current flow, leading to variations in display quality and increased power consumption.
Innovation Solution
A data line driving circuit configuration that includes a plurality of output circuits, a bias circuit, and switches to control the flow of bias signals, allowing for adjustable output numbers and efficient cutoff of electric current to unused outputs via control signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If several kinds of driver ICs with different output numbers are used simultaneously, then the display quality variation is suppressed, but the device complexity increases
Solution Approach 1:
The driver IC is divided into multiple output circuits (first output circuit to fourth output circuit) that can be independently controlled. Each output circuit can be selectively activated or deactivated, allowing the driver IC to adapt to different display panel configurations without requiring multiple different driver IC models.
Solution Approach 2:
The driver IC incorporates switching elements (first switch to fourth switch) that dynamically reconfigure the output circuits based on control signals. This dynamic reconfiguration capability allows the same driver IC to adapt its output number (e.g., 2, 3, or 4 outputs) according to the specific display panel requirements, eliminating the need for multiple static driver IC variants.
2Device complexity
If the output number of driver IC is fixed, then the device complexity is reduced, but the adaptability to different display configurations is limited
Solution Approach 1:
The driver IC is designed with universal output circuits that can serve multiple functions. The same output circuit infrastructure supports different output configurations (2, 3, or 4 outputs) through selective activation controlled by control signals. This multi-functionality allows a single driver IC design to replace multiple specialized driver IC variants.
Solution Approach 2:
The driver IC changes its operational parameters (output number) based on control signals received from the display apparatus. By adjusting which output circuits are active and how they are configured, the driver IC can adapt its output characteristics to match different display panel requirements, achieving parameter flexibility without increasing fundamental device complexity.
3Reliability
If bias signals are supplied to all output circuits, then the output performance is maintained, but the power consumption increases when some outputs are unused
Solution Approach 1:
The driver IC implements periodic or conditional activation of output circuits based on control signals. Instead of continuously supplying bias signals to all output circuits, the system selectively activates only the required output circuits for each operating mode. This conditional activation pattern reduces power consumption while maintaining reliable performance for the active outputs.
Solution Approach 2:
The driver IC applies different operational characteristics to different output circuits based on their usage status. When certain outputs are not needed, the corresponding output circuits receive different control (reduced or no bias signal), creating local quality differences in power supply. This ensures that power is consumed only where needed, reducing overall power consumption while maintaining performance where required.
Data Source
AI summary
A data line driving circuit for a display panel includes a plurality of output circuits, a bias circuit, and a plurality of switches. Each of the plurality of output circuits includes an electric current source which supplies electric current in response to a bias signal, and supplies a data voltage by using the electric current to a corresponding one of a plurality of data lines arranged in the display panel. The bias circuit generates the bias signal, and supplies the bias signal to the plurality of output circuits through bias wirings. The plurality of switches is provided between the bias circuit and the plurality of output circuits, and cuts off the bias wirings in response to a control signal.