Display Power Control for Static Images With Linear-Region Pixels
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Solution Overview
Problem
Existing display devices face challenges in optimizing power consumption and luminance by effectively managing the voltage of the first driving power supply, particularly during static image display.
Innovation Solution
A display device with a timing controller that adjusts the voltage of the first driving power supply based on load and peak grayscale values, reducing power consumption by driving transistors in a linear region during static images, and optimizing current flow through a sensing resistor and current sensing component.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the voltage of the first driving power supply is increased to increase luminance, then the luminance is improved, but the power consumption increases
Solution Approach 1:
The patent applies dynamics by making the voltage of the first driving power supply adjustable rather than fixed. The timing controller dynamically changes the voltage level based on whether a static image or moving image is being displayed. For static images, the voltage is reduced to save power while maintaining sufficient luminance, and for moving images, the voltage is increased to ensure adequate brightness. This dynamic adaptation resolves the contradiction between luminance and power consumption.
Solution Approach 2:
The patent changes the voltage parameter of the first driving power supply based on the type of image being displayed. By detecting whether the image is static or moving, the system adjusts the voltage parameter accordingly - lowering it for static images to reduce power consumption while maintaining acceptable luminance, and raising it for moving images to prioritize brightness. This parameter change strategy directly addresses the trade-off between luminance and power consumption.
2Use of energy by moving object
If the voltage of the first driving power supply is decreased to reduce power consumption, then the power consumption is reduced, but the luminance decreases
Solution Approach 1:
The system dynamically adjusts the voltage based on image content. When a static image is detected, the voltage is lowered to reduce power consumption while the reduced refresh rate requirements for static images allow the display to maintain acceptable luminance perception. When moving images are detected, the voltage is increased to ensure sufficient luminance. This dynamic approach resolves the contradiction by adapting voltage to actual display needs.
Solution Approach 2:
The timing controller periodically detects whether the displayed image is static or moving and adjusts the voltage accordingly. This periodic monitoring and adjustment allows the system to optimize power consumption during static image display while ensuring adequate luminance during moving image display, thereby resolving the contradiction between power consumption and luminance over time.
3Use of energy by moving object
If the refresh rate is decreased to reduce power consumption during static image display, then the power consumption is reduced, but the image quality may deteriorate
Solution Approach 1:
The patent applies dynamics by making the refresh rate adjustable based on image content. The timing controller detects whether the image is static or moving and dynamically changes the refresh rate accordingly. For static images, the refresh rate is reduced to lower power consumption while maintaining image quality since static images do not require frequent updates. For moving images, the refresh rate is increased to maintain image quality and prevent artifacts. This dynamic adaptation resolves the contradiction between power consumption and image quality.
Data Source
AI summary
A display device includes a display component including pixels connected to a first power line, a second power line, scan lines, and data lines; a sensing resistor between the first power line and the display component; a current sensing component connected to the sensing resistor, and configured to measure sensing current flowing through the first power line; a timing controller configured to generate a voltage code based on input data; and a power generator configured to supply first driving power having a voltage corresponding to the voltage code to the first power line, wherein, in response to a static image being displayed on the displayed component, the timing controller is configured to change the voltage code to decrease the first driving power, and wherein, in response to a decrease in the voltage of the first driving power, a driving transistor in a pixel is driven in a linear region.