Display Panel Scan Ratio Control for Power Reduction
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Solution Overview
Problem
Display devices face high power consumption and visibility deterioration when displaying still images, as existing pixel self-refresh techniques increase power usage due to added frame memory.
Innovation Solution
Implementing a driving method that uses different scan ratios for still and moving images, with a lower scan ratio for still images to reduce power consumption and maintain visibility by storing image data in a frame memory and adjusting clock signals and gamma correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a frame memory is added to implement pixel self refresh technique for displaying still images, then power consumption is reduced by not transmitting image data from GPU, but device complexity increases due to added frame memory
Solution Approach 1:
The patent creates a copy of the still image data by displaying the same image data across multiple frames at a reduced scan ratio. Instead of storing image data in a frame memory, the system copies the visual content by repeating frames, achieving pixel self refresh functionality without additional hardware components.
Solution Approach 2:
The patent changes the scan ratio parameter from the original high ratio to a lower ratio when displaying still images. This parameter change allows the display panel to operate at reduced refresh rates for static content, reducing power consumption without requiring frame memory infrastructure.
2Use of energy by moving object
If the display panel is driven at a lower scan ratio for still images, then power consumption is reduced, but visibility may deteriorate due to reduced refresh rate
Solution Approach 1:
The patent dynamically adjusts the scan ratio based on the type of content being displayed. The system switches between high scan ratio for moving images and low scan ratio for still images, optimizing both power consumption and visibility for each content type. This dynamic adaptation ensures visibility is maintained when needed while saving power when possible.
Solution Approach 2:
The display system monitors its own output to detect when the displayed content is static versus dynamic. Based on this self-assessment, the system automatically adjusts the scan ratio accordingly, making the visibility optimization decision without external intervention or complex additional sensors.
3Use of energy by moving object
If the scan ratio is changed between still and moving images, then power consumption is optimized, but visibility issues may occur during transitions between different scan ratios
Solution Approach 1:
The patent prepares for scan ratio transitions by maintaining the current scan ratio until the very end of the frame where the transition occurs. The still image is displayed with the second scan ratio until the frame in which the still image finish signal is applied ends, ensuring seamless transition without visibility issues.
Solution Approach 2:
The patent ensures continuous and smooth transition between different scan ratios by maintaining the display operation without interruption. The scan ratio change is executed at frame boundaries, ensuring that the useful action of displaying images continues without breaks or visible artifacts during the transition from still to moving image mode.
Data Source
AI summary
A display device including a display panel displaying a still image and a moving image and a signal controller controlling signals to drive the display panel, wherein the signal controller includes a frame memory storing image data of the still image and providing the image data to the display panel, and the display panel is driven with a first scan ratio when displaying the moving image and is driven with a second scan ratio that is lower than the first scan ratio when displaying the still image.