Display Panel Driver Afterimage Compensation
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Solution Overview
Problem
When black images are displayed on the left and right or top and bottom portions of a display panel for a long time, an afterimage of the boundary line between the black image and the normal image can persist, affecting display quality.
Innovation Solution
A display apparatus with a display panel driver that determines low luminance patterns based on the placement of low luminance areas on the display panel and applies compensation to reduce grayscale values in specific areas around the boundaries between low luminance and normal areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If black images are displayed on left and right portions or top and bottom portions of the display panel for a long time, then the display can show stable images, but an afterimage of the boundary line between the black image and the normal image persists
Solution Approach 1:
The patent applies preliminary action by performing compensation before the afterimage becomes problematic. The display panel driver identifies low luminance patterns and determines compensation areas in advance, then applies grayscale value adjustments to prevent the boundary line afterimage from forming or persisting. This proactive approach addresses the contradiction by preparing the display areas before the harmful afterimage effect occurs.
2Object-generated harmful factors
If compensation is applied to reduce grayscale values in compensation areas, then the afterimage is reduced, but the display panel driver complexity increases
Solution Approach 1:
The patent applies local quality by making different parts of the display panel have different properties. Specifically, it identifies specific compensation areas (such as areas adjacent to low luminance regions) and applies grayscale value adjustments only to those local regions rather than uniformly across the entire display. This targeted approach reduces afterimage in critical areas while minimizing the overall complexity of the driver system.
Solution Approach 2:
The patent applies parameter changes by modifying the grayscale values in specific compensation areas based on the detected low luminance patterns. The display panel driver adjusts these parameters dynamically - when low luminance areas are detected, it changes the grayscale values in adjacent compensation areas to prevent afterimage formation. This parameter adjustment approach provides a flexible solution that manages complexity while achieving afterimage reduction.
Data Source
AI summary
A display apparatus includes a display panel and a display panel driver. The display panel driver drives the display panel. The display panel driver determines at least one selected from a first low luminance pattern and a second low luminance pattern, where the first lower luminance pattern includes a first low luminance area at a first end portion of the display panel in a vertical direction and a second low luminance area at a second end portion of the display panel in the vertical direction, and the second low luminance pattern includes a third low luminance area at a first end portion of the display panel in a horizontal direction and a fourth low luminance area at a second end portion of the display panel in the horizontal direction. The display panel driver determines a compensation area including a boundary between a low luminance area and a normal area.