Staggered Light Emission Timing for Display Panel Frame Rate
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Solution Overview
Problem
Conventional light source control in liquid crystal display devices results in a low frame rate and afterimages in moving images due to the simultaneous illumination of entire regions, making it difficult to improve frame rate and reduce afterimage visibility.
Innovation Solution
A display device with a controller that controls light emission from multiple regions, where the light emission timing of pixel rows and light emission regions is staggered, allowing earlier start of pixel updates and reducing light irradiation time by arranging first and last driven pixel rows and light emission regions at the center or ends, and controlling light emission in a sequential order from one end to the other.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the light source illuminates the entire region at a time, then all pixels can be updated simultaneously, but the frame rate cannot be improved and afterimages occur in moving images
Solution Approach 1:
The light source device is divided into multiple light emission regions (first light emission region and second light emission region) that illuminate different pixel rows at different times. This segmentation allows sequential illumination of different regions, enabling pixel updates to overlap with light emission periods, thereby improving frame rate and reducing afterimage effects
Solution Approach 2:
Pixel updates for subsequent frames are performed during the light emission period of previous frames. By preparing pixel data in advance during intervals when other regions are being illuminated, the system achieves overlapping operations that increase productivity without extending total lighting time
2Object-affected harmful factors
If the light source illuminates the entire region at a time, then uniform illumination is achieved, but afterimages are likely to be viewed in moving images
Solution Approach 1:
The illumination process is segmented into distinct time intervals for different light emission regions. By illuminating the first light emission region and second light emission region sequentially rather than simultaneously, the total light irradiation time is reduced, which minimizes afterimage persistence in moving images
Solution Approach 2:
The light source device employs periodic illumination cycles where different light emission regions are activated in alternating periods. This periodic action creates intervals of reduced illumination that allow pixel response to complete before full illumination resumes, reducing afterimage effects while maintaining display continuity
Data Source
AI summary
A display device includes: a display panel with pixel rows; a light source device having light emission regions; and a controller configured to control light emission of the light emission regions. A second period is shorter than a first period. The first period is a period from a drive timing of one or more pixel rows that are driven first to a drive timing of one or more other pixel rows that are driven last. The second period is a period from a light emission timing of one or more light emission regions that emit light first to a light emission timing of one or more other light emission regions that emit light last. The light emission timing of the one or more light emission regions that emit light first is different from the light emission timing of the one or more other light emission regions that emit light last.