Low Power Sequential Image Display via Panel Frame Buffer
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Solution Overview
Problem
Display panels face increased power consumption when presenting multiple images, as they cannot self-refresh and require active host processors to continually update and send new images, limiting energy efficiency in low power modes.
Innovation Solution
Implementing a display system with a frame buffer and logic to decode and sequence multiple images during low power modes, allowing the display panel to remain active while the host processor is in a low power state, using MIPI DSI standards for command support and image storage, decoding, and rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the display panel uses self-refresh mode to improve energy efficiency, then power consumption is reduced, but the display cannot present multiple images sequentially
Solution Approach 1:
The patent divides the image presentation function into two independent parts: the host processor prepares and transfers multiple images to the display panel's frame buffer in advance, then the display panel's internal logic sequentially presents these images independently. This segmentation allows the host processor to enter low-power state while the display panel autonomously handles sequential image display, resolving the contradiction between energy efficiency and multi-image capability.
2Adaptability or versatility
If the host processor remains active to present multiple images, then multi-image display is enabled, but power consumption increases
Solution Approach 1:
The host processor performs preliminary actions by preparing multiple images and transferring them to the display panel's frame buffer before entering low-power state. This preliminary action enables the display panel to autonomously present multiple images sequentially without requiring the host processor to remain active, thus achieving multi-image capability while reducing power consumption.
3Use of energy by moving object
If the display panel autonomously displays multiple images, then power consumption is reduced, but device complexity increases
Solution Approach 1:
The display panel is designed with multi-functionality, integrating both the frame buffer for image storage and the sequential display logic for autonomous operation. This universal design allows the display panel to perform multiple functions (image storage, sequential display, and low-power operation) within a single component, reducing overall device complexity while enabling autonomous multi-image presentation.
Data Source
AI summary
Disclosed herein are techniques and a display panel that can sequentially display images while the host processor is inactive (e.g., asleep, power gated, or the like). The display panel includes circuitry to receive a set of encoded images, sequentially decode the encoded images provide a bitstream of the decoded images to the display electronics. The host is arranged to encode the images, send the encoded images to a frame buffer at the panel and configure the panel for a low power multi-image presentation mode.