Display Controller Resume Image Storage for Power-On Feedback
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Solution Overview
Problem
Computing devices, especially those with smaller form factors like tablets and laptops, often experience delays in displaying images after a power on event due to the time needed to power on various components, leading to confusion about input detection and battery power sufficiency.
Innovation Solution
A display device with a display controller that stores a resume image in memory and displays it upon power on, switching to actual image data once received from the computing device, allowing for immediate visual confirmation of a successful power on event and reducing user confusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the computing device waits for all components to power on before displaying images, then the system ensures all components are ready, but the display remains blacked out for an extended period causing user confusion
Solution Approach 1:
The patent applies preliminary action by storing a resume image in the display device's memory before the computing device fully powers on. When the display device detects a power on event, it immediately retrieves and displays the pre-stored resume image from its local memory, providing visual feedback without waiting for the computing device to complete its power-on sequence and send the actual image data.
2Speed
If the display device immediately displays content upon power on, then user feedback is provided quickly, but the computing device may not have fully powered on to provide image data
Solution Approach 1:
The display device performs preliminary action by pre-storing the resume image in its memory during the power down sequence. This allows the display to immediately display content upon power on event without waiting for the computing device's image data, while the computing device simultaneously completes its power-on sequence in the background.
Solution Approach 2:
The resume image acts as an intermediary solution that bridges the timing gap between the display device's immediate need for content and the computing device's delayed ability to provide image data. The display device displays the resume image as a placeholder until the actual image data becomes available.
3Loss of information
If the computing device stores image data in its memory, then image data is readily available, but the display device cannot display images independently during power on delays
Solution Approach 1:
The patent applies segmentation by dividing the image data storage function between two devices: the computing device stores the actual image data in its memory, while the display device stores a separate resume image in its own memory. This segmentation allows the display device to operate independently and display the resume image immediately upon power on, without being constrained by the computing device's power-on status.
Data Source
AI summary
Examples described herein generally relate to a display device and computing device where a display is configured for displaying images, a display controller is configured for receiving image data via a display port when coupled to a computing device, and sending signals to the display, based on the image data, to cause the display to display the images, and a memory is accessible by the display controller for storing a resume image received from the computing device. The display controller is further configured for detecting a power on event, accessing the memory to obtain the resume image, and sending signals to the display to cause display of the resume image based at least in part on detecting the power on event.