Display Driver IC Amplifier Switching for Low-Refresh Power Saving
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Solution Overview
Problem
Electronic devices with 'always-on' displays consume significant power, reducing their operational duration and necessitating frequent recharging.
Innovation Solution
A display driver integrated circuit (DDIC) with a power-conserving configuration that dynamically adjusts amplifier usage based on refresh rates, enabling a power-efficient mode by disabling a subset of amplifiers and routing display data to enabled amplifiers in a serial manner.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If all amplifiers are enabled to support multiple channels at standard refresh rates, then display functionality and refresh rate are maintained, but power consumption increases
Solution Approach 1:
The display driver integrated circuit dynamically adjusts the number of enabled amplifiers based on the detected refresh rate. When operating at power-efficient refresh rates, the system disables unnecessary amplifiers while maintaining functionality at lower refresh rates. This dynamic configuration allows the system to adapt its power consumption characteristics to match the actual display requirements.
Solution Approach 2:
The system changes operational parameters by selectively enabling or disabling amplifiers based on the refresh rate being used. At standard refresh rates, all amplifiers are enabled to maintain full display functionality. At power-efficient refresh rates, the system modifies the operational state by disabling a subset of amplifiers, thereby changing the power consumption parameter while maintaining adequate display performance.
2Use of energy by moving object
If a subset of amplifiers is disabled to conserve power, then power consumption is reduced, but the ability to support standard refresh rates is compromised
Solution Approach 1:
The system implements dynamic amplifier management where the number of active amplifiers is adjusted in real-time based on the display refresh rate requirements. This allows the system to optimize power consumption at lower refresh rates while maintaining full amplifier availability when high refresh rates are needed, creating a dynamic trade-off between power efficiency and display performance.
Solution Approach 2:
The system applies partial action by enabling only the necessary subset of amplifiers required for the current refresh rate rather than all amplifiers. At power-efficient refresh rates, fewer amplifiers are activated than the maximum capacity, which is sufficient for the reduced refresh rate requirements while conserving power.
3Duration of action of moving object
If amplifiers are disabled for power efficiency, then battery life is extended, but display performance at high refresh rates is reduced
Solution Approach 1:
The display driver integrated circuit implements dynamic configuration that adjusts amplifier availability based on display performance requirements. When battery conservation is prioritized, the system operates with fewer amplifiers at reduced refresh rates. When display performance is prioritized, the system enables all amplifiers to support standard refresh rates, dynamically balancing battery life and display performance based on operational context.
Solution Approach 2:
The system changes operational parameters by selectively activating amplifiers based on the desired balance between battery life and display performance. This parameter adjustment allows the system to operate in different modes: a power-efficient mode with reduced amplifier usage for extended battery life, and a performance mode with full amplifier availability for optimal display performance.
Data Source
AI summary
Techniques and apparatuses are described that implement a display driver integrated circuit with a power-conserving configuration. In an example aspect, a display module of a device includes a display driver integrated circuit that can control operations of multiple channels within a display panel of the display module. The display driver integrated circuit can operate in different configurations as a refresh rate of the display panel changes over time. At least one of these configurations includes a power-conserving configuration, which disables a subset of amplifiers to conserve power. The display driver integrated circuit includes driver switching circuitry that can route display data for two or more different channels of the display panel to one of the amplifiers that is enabled during the power-conserving configuration. In this way, the display driver integrated circuit can conserve power by operating with fewer amplifiers while supporting some refresh rates of the display panel.