Display Driver Dynamic Voltage Scaling for Low-Power Refresh
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Solution Overview
Problem
Existing display devices face challenges in optimizing power consumption without degrading display quality and performance, particularly in portable devices where battery life and heat generation are critical concerns.
Innovation Solution
A low-power display driver incorporating a voltage adjustment part, frame memory, digital circuit part, and control part, including an MCU, to dynamically adjust driving voltage based on image frame frequency, refresh rate, and operational states of functional blocks, using an LDO to optimize power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the driving voltage is maintained at a high level to ensure display quality and performance, then display quality is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic voltage adjustment by monitoring operational states of functional blocks and frame frequency, then adjusting the driving voltage in real-time. The voltage is increased only when needed for high-quality display operations and reduced during low-demand periods, resolving the contradiction between maintaining display quality and reducing power consumption.
Solution Approach 2:
The system changes the voltage parameter based on operational conditions. By detecting frame frequency and functional block states, the controller adjusts the driving voltage to appropriate levels, ensuring display quality is maintained during high-performance modes while minimizing power consumption during lower-demand operations.
2Use of energy by moving object
If the driving voltage is reduced to optimize power consumption, then power consumption decreases, but display quality may degrade
Solution Approach 1:
The patent employs feedback mechanisms where the controller continuously monitors operational states and frame frequency, then adjusts voltage accordingly. This closed-loop control ensures that voltage is reduced only when display quality requirements allow, preventing degradation while optimizing power consumption.
Solution Approach 2:
The system dynamically adapts voltage levels based on real-time operational conditions rather than using a fixed voltage. This dynamic adjustment ensures display quality is maintained at appropriate levels for each operational context while minimizing power consumption.
3Productivity
If the refresh rate is increased to improve display performance, then display performance is improved, but power consumption increases
Solution Approach 1:
The system dynamically adjusts voltage based on detected frame frequency. When high refresh rates are required for improved display performance, the voltage is increased to support the higher performance demand. When lower refresh rates suffice, voltage is reduced, optimizing the balance between display performance and power consumption.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Reduces power consumption while maintaining display quality by dynamically adjusting driving voltage levels in response to operational states and image characteristics, extending battery life and reducing heat generation.
Implementation Method 1
a voltage adjustment part configured to receive a driving voltage from a power supply and to output a first voltage and a second voltage
Data Source
AI summary
A display driver and a display device including the same are disclosed. The display driver includes a voltage adjustment part that receives a driving voltage from a power supply and outputs a first voltage and a second voltage; a frame memory that receives the first voltage and stores pixel data of input images; a digital circuit part that is driven by receiving the second voltage and includes a memory, a plurality of functional blocks, and a power controller; and a control part that generates a control signal for controlling the driving voltage in response to a signal input from the digital circuit part.