Source Driver Circuit Power Reduction via Buffer Segmentation
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Solution Overview
Problem
Current source driver circuits for display panels consume excessive power when driving non-display areas, as they continue to operate fully even when no visual information is being displayed, leading to increased power consumption without providing any visual output.
Innovation Solution
The proposed source driver circuit includes a control logic circuit that receives a power-down signal, allowing it to turn off amplifying buffers and disconnect non-display voltage nodes when not in use, thereby reducing power consumption by generating driving signals only when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the source driver circuit operates fully to drive the non-display area, then the display panel can display images in the non-display area, but power consumption increases significantly
Solution Approach 1:
The source driver circuit is divided into multiple independent amplifying buffers, each corresponding to a specific column of the display panel. The control logic circuit can independently control each amplifying buffer to operate or remain in standby mode based on whether its corresponding column belongs to the display area or non-display area, enabling selective power management at the buffer level
Solution Approach 2:
The circuit transitions from a static full-operation mode to a dynamic mode where the control logic circuit continuously monitors the display area information and dynamically adjusts the operating state of each amplifying buffer. This dynamic adaptation allows the circuit to optimize power consumption in real-time based on the actual display requirements
2Reliability
If the source driver circuit operates fully, then all areas of the display panel receive driving signals, but power is wasted when no visual information is displayed
Solution Approach 1:
Instead of providing driving signals to all columns uniformly, the circuit applies partial action by activating only those amplifying buffers corresponding to display area columns. The control logic circuit determines which columns require driving signals based on display area information, enabling the circuit to perform exactly the necessary function without excess operation
Solution Approach 2:
Different amplifying buffers are assigned different operational characteristics based on their corresponding column positions. Buffers corresponding to display area columns maintain full operational capability, while buffers corresponding to non-display area columns are placed in low-power standby mode, creating local quality differences in power consumption across the circuit
3Use of energy by moving object
If the source driver circuit is simplified to reduce power consumption, then power usage decreases, but the ability to display images in non-display areas is lost
Solution Approach 1:
The source driver circuit is designed with universal amplifying buffers that can serve multiple functions: they can drive both display area columns and non-display area columns depending on their operational state. By controlling whether each buffer is active or in standby, the same hardware infrastructure supports both full-display mode and partial-display mode, providing multi-functionality without requiring separate circuit paths
Data Source
AI summary
A source driver circuit includes a receiver, a plurality of amplifying buffers, and a control logic circuit. The receiver receives a data signal and a control signal through an input terminal. Each of the amplifying buffers outputs a driving signal generated based on the image data signal through an output terminal. The control logic circuit controls the receiver and the plurality of amplifying buffers based on the control signal. When a power-down signal is provided to the receiver, the control logic circuit is to turn off at least one of the receiver and the plurality of amplifying buffers.