Display Panel Emission Timing for Mixed Refresh Luminance Matching
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Solution Overview
Problem
In conventional display apparatuses, the difference in luminance between moving and still image areas due to varying driving frequencies results in visible luminance discrepancies, degrading display quality.
Innovation Solution
The display apparatus adjusts the width of the non-emission period of emission signals based on the driving frequency, ensuring that the luminance in moving and still image areas is matched by varying the non-emission period widths accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If different driving frequencies are applied to moving image area and still image area, then moving images can be displayed with high refresh rate, but luminance difference becomes visually recognizable
Solution Approach 1:
The patent applies different non-emission period widths to different display areas: the moving image area uses a first non-emission period width corresponding to its high driving frequency, while the still image area uses a second non-emission period width corresponding to its low driving frequency. This local differentiation ensures each area maintains appropriate luminance characteristics for its content type, preventing visible luminance differences at area boundaries.
Solution Approach 2:
The patent changes the non-emission period width parameter based on driving frequency and display area type. By adjusting this temporal parameter, the patent compensates for luminance differences that would otherwise occur due to varying refresh rates, thereby maintaining overall luminance uniformity across the display panel.
2Device complexity
If constant non-emission period width is used, then emission signal generation is simple, but luminance difference between moving and still image areas degrades display quality
Solution Approach 1:
The emission signal is segmented into different types based on display area: a first emission signal for the moving image area with a first non-emission period width, and a second emission signal for the still image area with a second non-emission period width. This segmentation allows precise control of luminance in each area while maintaining manageable signal generation complexity through systematic differentiation.
Data Source
AI summary
A display apparatus includes a display panel including a pixel to display an image based on input image data, a driving controller which determines a driving frequency of a first display area of the display panel to be a first driving frequency and determines a driving frequency of a second display area of the display panel to be a second driving frequency less than the first driving frequency when the first display area displays a moving image and the second display area of the display panel displays a still image, and an emission driver which outputs a moving image emission signal corresponding to the first driving frequency and a still image emission signal corresponding to the second driving frequency to the display panel. A width of a non-emission period of the still image emission signal is greater than a width of a non-emission period of the moving image emission signal.