Display Driver Gradation Image for Foldable Panel
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Solution Overview
Problem
Display devices, especially foldable and rollable ones, face challenges in maintaining image quality due to the image sticking phenomenon when switching between full and partial display modes, leading to luminance differences and reduced image quality.
Innovation Solution
A display device with a processor and display driver that generates specific image data for different modes, including a partial display mode where a gradation image is displayed on adjacent areas, reducing luminance gradually to prevent rapid luminance changes and pixel deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a display device supports multiple display modes (full display and partial display), then ease of use is improved, but image sticking phenomenon occurs leading to reduced image quality
Solution Approach 1:
The patent applies preliminary action by displaying a gradation image in advance on the second display area before switching from full display mode to partial display mode. This pre-action maintains pixel activity and prevents image sticking phenomenon, ensuring image quality is preserved when multiple display modes are supported
Solution Approach 2:
The patent changes the luminance parameter of the display area by introducing a gradation image with gradually reduced luminance values. This parameter change keeps pixels active at varying intensity levels, preventing the image sticking phenomenon while maintaining ease of use across different display modes
2Productivity
If the entire display area is used for displaying valid images, then productivity is improved, but luminance differences cause image sticking phenomenon
Solution Approach 1:
The patent applies local quality by displaying a gradation image specifically in the second display area adjacent to the first display area. This localized approach maintains pixel activity where needed without compromising the overall productivity of the display system
Solution Approach 2:
The gradation image is displayed in advance in the second display area before mode switching occurs. This preliminary action prevents image sticking by maintaining pixel activity, allowing the display to transition between full and partial display modes without quality degradation
3Reliability
If rapid luminance changes are prevented by displaying gradation images, then image quality is improved, but device complexity increases
Solution Approach 1:
The patent segments the display area into a first display area for valid images and a second display area for the gradation image. This segmentation allows the display driver to handle different regions differently, managing complexity through structured division rather than uniform processing
Solution Approach 2:
The gradation image acts as an intermediary between full display mode and partial display mode. It mediates the transition by maintaining pixel activity without requiring complex real-time adjustments, simplifying the overall system while improving image quality
Data Source
AI summary
A display device includes a display panel which includes first and second display areas adjacent to each other, a processor which generates first image data corresponding to the first and second display areas if a display mode is a first mode, and generates second image data corresponding to the first display area if the display mode is a second mode and a display driver which generates a first data signal corresponding to the first image data in the first mode, and converts the second image data and generates a second data signal corresponding to the converted second image data in the second mode. When the display device is driven in the second mode, a gradation image may be displayed on at least a region of the second display area.