Panel-Region Voltage Control for Lower-Power Display Panels
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Solution Overview
Problem
Existing display devices apply the same power supply voltage to all pixels, leading to increased power consumption even when only a portion of the display panel displays a low luminance image, as the power supply voltage cannot be decreased to match the lower luminance requirements.
Innovation Solution
The display panel is divided into multiple regions, with a panel driver providing distinct power supply voltages to each region based on the average gray level of the image data, and adjusting these voltages during emission periods or frame periods to minimize luminance changes and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If the same power supply voltage is applied to all pixels, then the display device can maintain stable operation across the entire panel, but power consumption cannot be reduced when only a portion of the panel displays low luminance
Solution Approach 1:
The display panel is divided into multiple regions (first panel region and second panel region) with separate mesh lines electrically disconnected from each other. The panel driver independently controls the power supply voltage for each region, allowing the first region displaying low luminance to receive a lower power supply voltage while the second region displaying high luminance maintains a higher voltage, thereby reducing overall power consumption without affecting display quality in high luminance areas
Solution Approach 2:
Different power supply voltage levels are applied to different regions based on their specific display requirements. The panel driver determines a first power supply voltage for the first panel region and a second power supply voltage for the second panel region, where the voltages differ according to the luminance characteristics of each region. This local optimization reduces power consumption in low luminance regions while maintaining adequate voltage in high luminance regions
2Use of energy by stationary object
If the power supply voltage is decreased to reduce power consumption, then energy efficiency improves, but luminance stability deteriorates due to voltage fluctuations during emission periods
Solution Approach 1:
The panel driver changes the power supply voltage to the target voltage level at a specific timing: at the end portion of the emission period for the corresponding panel region. This timing ensures that the voltage adjustment occurs after the emission period concludes, preventing any luminance fluctuation during the actual emission phase. The voltage is adjusted in advance for the next frame, maintaining both power efficiency and luminance stability
Solution Approach 2:
The panel driver analyzes the region image data for each panel region to determine the appropriate target voltage level. By calculating the average gray level of the image data and referencing a gray-voltage lookup table, the system dynamically adjusts the power supply voltage to match the actual display requirements of each region, optimizing power consumption while maintaining luminance stability
Data Source
AI summary
A display device includes: a display panel including a plurality of pixels, the display panel being divided into a plurality of panel regions; and a panel driver configured to drive the display panel based on input image data, and to provide a plurality of power supply voltages to the plurality of panel regions, respectively, wherein the panel driver is further configured to: divide the input image data for the display panel into a plurality of region image data for the plurality of panel regions; determine a target voltage level of each of the plurality of power supply voltages by analyzing a corresponding one of plurality of region image data; and change each of the plurality of power supply voltages to the target voltage level in an end portion of an emission period for a corresponding one of the plurality of panel regions.