Flexible Display Driver Standby Gray Level Compensation
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Solution Overview
Problem
Flexible electronic paper display apparatuses experience performance degradation due to mechanical fatigue when folded or rolled, leading to visible disuniformity in the image frame, which affects user experience.
Innovation Solution
A display apparatus and driving method where a display driver adjusts the gray level of the display panel to a predetermined level in a standby state, calculated based on the image frame's gray levels, to minimize perceived disuniformity when the panel is in use again, using techniques such as selecting median or average gray levels, or employing dot patterns to distribute failed pixels evenly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display panel is folded or rolled for a long time or multiple times, then the flexibility and portability are improved, but the display performance deteriorates due to mechanical fatigue effect
Solution Approach 1:
The display driver performs preliminary actions by calculating and applying a compensation value to the gray level before displaying the standby frame. This preliminary compensation based on usage time or usage intensity prevents the user from perceiving display non-uniformity caused by mechanical fatigue, thereby maintaining display performance while allowing flexible usage
2Device complexity
If the gray level of the standby frame is set to a fixed value, then the implementation is simple, but the display non-uniformity caused by mechanical fatigue becomes more visible
Solution Approach 1:
The patent applies dynamics by making the standby frame gray level adjustable rather than fixed. The display driver dynamically determines the gray level based on usage time or usage intensity, and applies compensation values to compensate for mechanical fatigue effects. This dynamic adjustment maintains display uniformity while managing the complexity through algorithmic approaches
3Manufacturing precision
If the display panel uses multiple gray levels to display the image frame, then the image quality is improved, but the perception of display non-uniformity increases when the panel is folded or rolled
Solution Approach 1:
The patent applies local quality by treating different regions of the display panel differently through region-specific compensation. The display driver calculates compensation values based on the specific gray levels used in different regions and applies appropriate compensation to each region's standby frame display, thereby maintaining local image quality while compensating for mechanical fatigue effects in each region
Data Source
AI summary
A display apparatus including a display panel and a display driver is provided. The display driver is coupled to the display panel. The display driver is configured to drive the display panel by at least one of a plurality of gray levels to display an image frame in a first state. The display driver is configured to drive the display panel by a predetermined gray level to display a standby frame in a second state. The display driver determines the predetermined gray level of the standby frame according to the gray levels of the image frame. In addition, a driving method of a display apparatus is also provided.