Display Driver Voltage Scaling for Low-Luminance Power Reduction
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Solution Overview
Problem
Conventional display apparatuses face high power consumption due to fixed high power voltage and data voltage levels, which are not adjusted according to luminance settings, leading to inefficiencies in power usage.
Innovation Solution
The display apparatus varies data power voltage and maximum data voltage based on luminance settings, while maintaining a fixed minimum data voltage, thereby adjusting the driving current in proportion to the difference between data voltage and reference voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high power voltage and data voltage are fixed in conventional pixels, then the display can maintain stable operation across different luminance settings, but power consumption increases unnecessarily in low luminance modes
Solution Approach 1:
The patent applies dynamics by making the data power voltage and maximum data voltage adjustable rather than fixed. The power voltage generator dynamically changes these voltages based on luminance settings, allowing the display to adapt its power consumption to the actual display requirements while maintaining stable operation through controlled voltage adjustment.
Solution Approach 2:
The patent changes the voltage parameters (data power voltage and maximum data voltage) according to luminance settings. By varying these parameters based on whether the display is in high or low luminance mode, the system optimizes power consumption without compromising display stability or image quality.
2Ease of operation
If high power voltage is fixed to ensure proper pixel operation, then pixel driving is simplified, but power consumption cannot be optimized for different luminance modes
Solution Approach 1:
The system transitions from static fixed voltage to dynamic adjustable voltage. The power voltage generator responds to luminance setting changes by adjusting data power voltage and maximum data voltage, enabling energy optimization while maintaining proper pixel driving through controlled voltage variation.
Solution Approach 2:
The patent modifies the voltage parameters supplied to the data driver based on luminance modes. In low luminance mode, reduced voltages lower power consumption, while in high luminance mode, full voltages ensure proper pixel operation, thus optimizing energy usage without compromising ease of operation.
3Loss of energy
If data power voltage is reduced in low luminance mode, then power consumption decreases, but the voltage must be carefully controlled to maintain image quality
Solution Approach 1:
The system uses feedback from luminance setting detection to control voltage adjustment. The power voltage generator receives luminance setting information and automatically adjusts data power voltage and maximum data voltage accordingly, ensuring that image quality is maintained while optimizing power consumption based on actual display requirements.
Solution Approach 2:
The patent carefully adjusts voltage parameters based on luminance modes. By changing data power voltage and maximum data voltage in response to luminance settings, the system achieves both energy savings and image quality control through parameter optimization rather than arbitrary voltage reduction.
Data Source
AI summary
A display includes a display panel, a data driver and a power voltage generator. The display panel includes a pixel configured to emit a light based on a first power voltage and a second power voltage less than the first power voltage. The data driver is configured to output a data voltage to the pixel. The power voltage generator is configured to output a data power voltage, a maximum data voltage and a minimum data voltage to the data driver. A luminance setting value varies, the data power voltage and the maximum data voltage are varied, and the minimum data voltage is fixed.