Flexible Display Timing Controller for Accurate Sub-Pixel Compensation
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Solution Overview
Problem
Rollable display apparatuses face challenges in maintaining image quality due to physical deformation, which affects the electrical characteristics of sub-pixels, leading to uneven compensation and visible stains or borders during image display.
Innovation Solution
A flexible display device with a timing controller that identifies movement states and exposed areas, determining a sensing target area and scheme to perform accurate sub-pixel deterioration compensation only on visible areas, thereby avoiding inaccurate sensing due to physical changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display panel is wound around the roller or bent, then the flexible display device achieves compact storage and portability, but the electrical characteristics of elements or conductors change due to physical deformation
Solution Approach 1:
The timing controller performs sensing operations on sub-pixels before the display panel is wound around the roller or bent. By detecting and compensating for sub-pixel deterioration in advance, the system ensures that electrical characteristic changes during deformation do not affect image display quality.
2Measurement precision
If a sensing operation is performed on the entire display panel including wound and exposed areas, then comprehensive sub-pixel deterioration compensation is achieved, but inaccurate sensing results occur due to electrical characteristic changes in the wound area
Solution Approach 1:
The timing controller determines a sensing target area based on the current state of the display panel (wound or exposed). The sensing operation is performed only on the appropriate area - exposed area when not wound, or specific wound area when partially wound - ensuring accurate sensing while avoiding unnecessary operations on areas with unstable electrical characteristics.
3Reliability
If sensing and compensation operations are performed on both wound and exposed areas, then complete deterioration compensation is achieved, but borderline or block-shaped stains appear due to different sensing results
Solution Approach 1:
The timing controller identifies the current state of the display panel and determines a sensing target area accordingly. When the display panel is not wound, the entire exposed area is sensed. When partially wound, only the appropriate area is sensed, avoiding inconsistent compensation results that would cause borderline or block-shaped stains.
4Measurement precision
If the display panel is fully exposed, then accurate sensing operation can be performed, but the compact storage and portability features are lost
Solution Approach 1:
The timing controller performs sensing operations on sub-pixels before the display panel is wound around the roller or bent. By detecting and compensating for sub-pixel deterioration in advance, the system enables accurate sensing even when the panel is in a compact wound state, eliminating the need for full exposure.
Data Source
AI summary
Discussed are a flexible display device, a rollable display apparatus including the flexible display device, and a method for controlling the flexible display device. According to embodiments, a sensing operation is performed based on whether a display panel included in the flexible display device moves and based on an exposed area of the display panel. Accordingly, an inaccurate sensed value due to a physical change of the display panel are not considered, such that accurate sensing and deterioration compensation for deterioration of the display panel can be achieved. Further, an image quality of each of the flexible display device, and the rollable display apparatus including the flexible display device can be improved.