Display Switch Bank for Power and Speed Trade-offs
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Solution Overview
Problem
Flat panel displays with high aspect ratios and increased frame rates face challenges in power consumption due to high column line switching frequencies, which lead to increased parasitic capacitance and the need for larger switching devices, resulting in higher power consumption.
Innovation Solution
A method and system that utilize a panel-switch bank and driver-switch bank with sub-switches connected in parallel, where the sub-switches are controlled based on the frame rate to either deactivate or activate them, reducing power consumption by adjusting resistance and capacitance accordingly, thereby optimizing power usage at both low and high frame rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the frame rate is increased to improve display performance, then the switching frequency of column data lines must be increased, but this increases parasitic capacitance and requires larger switching devices, resulting in higher power consumption
Solution Approach 1:
The patent applies dynamics by making the switch configuration adaptive rather than fixed. The system dynamically reconfigures the number of active parallel switches based on the detected frame rate: using more switches at high frame rates to reduce resistance and parasitic capacitance effects, and using fewer switches at low frame rates to minimize power consumption. This dynamic adjustment resolves the contradiction by allowing the system to optimize for speed when needed and for energy efficiency when performance demands are lower.
Solution Approach 2:
The patent changes the electrical parameters of the switching circuit by varying the number of active parallel switches. At high frame rates, the system activates more switches in parallel to reduce the effective resistance and capacitance of the column data line, improving switching performance. At low frame rates, it deactivates switches to reduce the overall power consumption of the switching circuit. This parameter change strategy directly addresses the trade-off between speed and energy consumption.
2Reliability
If larger switching devices are used to compensate for parasitic capacitance at high switching frequencies, then the power consumption increases
Solution Approach 1:
The patent merges multiple switches in parallel to create an equivalent switching circuit with lower resistance and capacitance. Instead of using a single large switch to handle high-frequency switching, the system combines multiple smaller switches in parallel, achieving the same electrical performance with reduced individual switch sizes and lower overall power consumption. This merging strategy resolves the contradiction by distributing the switching load across multiple devices rather than relying on one large power-hungry component.
3Use of energy by moving object
If parallel switches are always connected to reduce resistance, then the power consumption increases continuously, but if they are disconnected to save power, then the switching speed decreases
Solution Approach 1:
The system dynamically adjusts the number of active parallel switches based on real-time frame rate detection. At high frame rates, it activates more switches to improve switching speed and reduce resistance. At low frame rates, it deactivates switches to minimize power consumption. This dynamic control ensures that the switching circuit is optimized for either speed or energy efficiency depending on the current operational requirements, resolving the contradiction between continuous power consumption and switching performance.
Data Source
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AI summary
A flat panel display that includes a switch bank to couple a signal from a driver integrated circuit to a column data line of a display panel is disclosed. The switch bank can be adjusted based on the frame rate of the display. When the frame rate is high, all sub-switches in the switch bank may be used to reduce an ON resistance of the switch bank. This high frame rate configuration may maintain or increase the speed at which pixels can be controlled but consumes more power. Accordingly, when the frame rate is low, a portion of the sub-switches in the switch bank are unused to reduce the power consumed. This low frame rate configuration may maintain or decrease the speed at which pixels of the display can be controlled but consumes less power.