Dynamic Gamma Voltage Control for Display Power Reduction
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Solution Overview
Problem
Conventional display devices apply a constant gamma driving voltage, leading to unnecessary high gamma reference voltages being applied, resulting in increased power consumption and inefficient grayscale control.
Innovation Solution
A display device that dynamically controls gamma driving voltage based on image signal grayscale levels, using a signal controller to divide image signals, extract maximum grayscale signals, and generate voltage adjustments for data driving circuits, while also managing backlight brightness through light emitting diodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a constant gamma driving voltage is applied to the data driving circuit, then the gamma reference voltages cover all grayscale periods, but unnecessary high level gamma reference voltages are applied resulting in increased power consumption
Solution Approach 1:
The gamma driving voltage is changed from a constant DC voltage to a dynamically adjustable voltage that varies according to the maximum grayscale level detected in the current frame. The power supply unit adjusts the gamma driving voltage level based on feedback from the signal controller about the actual grayscale requirements, ensuring that only the necessary voltage level is applied to match the actual image content demands.
Solution Approach 2:
The gamma driving voltage parameter is adjusted based on the maximum grayscale level of the image signal. When the maximum grayscale level is low, a lower gamma driving voltage is applied; when the maximum grayscale level is high, a higher gamma driving voltage is applied. This parameter adaptation eliminates the waste of applying high voltage when low grayscale levels are sufficient.
2Adaptability or versatility
If high level gamma reference voltages are applied to cover all grayscale periods, then all grayscale levels can be displayed, but power consumption increases due to unnecessary high voltage application
Solution Approach 1:
Instead of always applying the maximum gamma driving voltage to cover all possible grayscale periods, the system applies only the partial voltage necessary for the current frame's actual grayscale requirements. The signal controller detects the maximum grayscale level and instructs the power supply to apply only that level of voltage needed, avoiding excessive voltage application and the associated energy waste.
Solution Approach 2:
The signal controller analyzes the image signal to determine the maximum grayscale level required and provides feedback to the power supply unit. Based on this feedback, the power supply adjusts the gamma driving voltage to the appropriate level, ensuring that voltage is applied only when and to the extent that it is actually needed for displaying the current image content.
3Illumination intensity
If the backlight source operates at maximum brightness, then the display panel receives sufficient light, but power consumption increases
Solution Approach 1:
The backlight source operates at a dynamically adjusted brightness level rather than a fixed maximum level. The signal controller determines the appropriate backlight brightness based on the maximum grayscale level of the image signal and controls the backlight accordingly, allowing the illumination intensity to adapt to the actual display requirements and reduce power consumption when maximum brightness is not needed.
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 by applying only necessary gamma reference voltages and adjusting backlight brightness according to image content, optimizing energy use and display performance.
Implementation Method 1
a backlight source configured to provide light to the display panel
Data Source
AI summary
A display device includes: a display panel including first group pixels connected to a first gate line to receive first data voltages, and second group pixels connected to the first gate line to receive second data voltages; a backlight source to provide light to the display panel; a signal controller to divide horizontal image signals into first group image signals and second group image signals, to extract a first maximum grayscale image signal from the first group image signals, and to extract a second maximum grayscale image signal from the second group image signals; a power supply to generate first and second gamma driving voltages from a reference gamma driving voltage based on a grayscale level of the first maximum grayscale image signal and a grayscale level of the second maximum grayscale image signal.