Display Device Refresh Rate Control for Smooth Video
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Solution Overview
Problem
Conventional liquid crystal display devices using pause drive methods experience smoothness issues in video display due to infrequent screen refresh during animation or rotation video playback, leading to incomplete frame updates.
Innovation Solution
A display device with a control portion that adjusts the refresh rate to ensure screen refresh occurs for each frame during the video display period, balancing the refresh and no-refresh periods to maintain smooth video playback while reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If pause drive is performed with infrequent screen refresh, then power consumption is reduced, but video smoothness deteriorates due to incomplete frame updates
Solution Approach 1:
The display device dynamically adjusts the refresh rate based on the type of content being displayed. When animation video or rotation video is detected, the system switches from pause drive (low refresh rate) to continuous drive (high refresh rate), ensuring smooth video playback. For static images, pause drive is maintained to save power. This dynamic adaptation resolves the contradiction by optimizing refresh behavior according to actual display needs.
Solution Approach 2:
The invention changes the refresh rate parameter from a fixed low value during pause drive to a high value during video display period. Specifically, the refresh rate is increased to match the video frame rate when animation or rotation video is detected, ensuring that each frame is properly refreshed. This parameter change allows the system to maintain video smoothness while still utilizing pause drive for power savings during appropriate periods.
2Reliability
If refresh rate is increased to update every frame, then video smoothness is improved, but power consumption increases
Solution Approach 1:
The display device employs periodic action by alternating between pause drive periods (low refresh rate) and continuous drive periods (high refresh rate). During the video display period, continuous drive is used to ensure smooth video playback with every frame refreshed. After the video display period, the system returns to pause drive to reduce power consumption. This periodic switching resolves the contradiction by applying high refresh rate only when necessary for video smoothness.
Solution Approach 2:
The system dynamically adjusts the refresh rate based on content type detection. When animation video or rotation video is detected during the video display period, the refresh rate is increased to match the video frame rate. When static images are displayed, the refresh rate is reduced to pause drive levels. This dynamic adjustment ensures video smoothness is maintained only when needed, optimizing power consumption accordingly.
3Use of energy by stationary object
If pause drive is used for static images, then power consumption is reduced, but video display quality deteriorates
Solution Approach 1:
The invention changes the refresh rate parameter dynamically based on content type. During the video display period, when animation video or rotation video is detected, the refresh rate is increased to ensure proper frame updates and maintain display quality. During periods of static image display, the refresh rate is reduced to pause drive levels to save power. This parameter change strategy resolves the contradiction by optimizing refresh behavior according to actual display needs.
Solution Approach 2:
The display device dynamically adapts its refresh behavior based on content type detection. When video content (animation or rotation) is detected, the system switches to continuous drive with high refresh rate to maintain display quality. When static images are displayed, pause drive with low refresh rate is used to reduce power consumption. This dynamic adaptation resolves the contradiction between power savings and display quality by applying appropriate refresh strategies contextually.
Data Source
AI summary
Provided is a display device capable of displaying a smooth video even when pause drive is performed.In a liquid crystal display device with an animation function, 12-Hz pause drive is performed with vertical display periods, each having a duration of five frames. In a video display period, an animation video changes every duration of a secondary video display period, i.e., every one frame, in the order: images A to X, then A and B. Once the video display period starts, 12-Hz pause drive switches to 60-Hz normal drive. In this case, for the animation video that changes every duration of the secondary video display period, i.e., every one frame, in the order: images A to X, then A and B, refresh is performed every duration of the vertical display period, i.e., every one frame. In this manner, the duration of the vertical display period is set to be the same as the duration of the secondary video display period, whereby refresh is performed individually for images A to X, A, and B included in the animation video.