Staggered Pixel Refreshing for LCD Peak Current Reduction
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Solution Overview
Problem
Liquid crystal display (LCD) devices face issues with power consumption and memory stability due to peak current and voltage bounce during pixel refreshing, leading to potential data loss and image sticking.
Innovation Solution
A display device with a display unit and refreshing units that divide pixels into groups for staggered refreshing, using separate refresh signal sets to minimize peak current and voltage bounce by distributing the ripple effects across different time points, thereby reducing power consumption and maintaining pixel data integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pixels are refreshed simultaneously to maintain display functionality, then display operation is maintained, but peak current and voltage bounce occur causing memory instability and data loss
Solution Approach 1:
The patent divides the pixel array into multiple groups (e.g., first group and second group) and refreshes each group at different time points. This segmentation approach distributes the peak current and voltage bounce across different time periods, preventing simultaneous refreshing from causing memory instability and data loss while maintaining continuous display operation.
2Reliability
If pixel data is continuously refreshed to prevent image sticking, then display quality is maintained, but power consumption increases due to continuous operation
Solution Approach 1:
The patent implements periodic refreshing of pixel groups at different time points rather than continuous simultaneous refreshing. This periodic action with staggered timing maintains display quality by preventing image sticking while reducing overall power consumption by distributing the refreshing load over time.
3Device complexity
If all pixels are refreshed at the same time to simplify control, then control complexity is reduced, but steep peak current and voltage bounce occur endangering memories
Solution Approach 1:
The patent segments pixels into multiple groups with different refresh timing, which increases control complexity slightly but dramatically improves memory safety by eliminating steep peak current and voltage bounce. The segmented approach distributes the electrical load across different time periods, protecting memories from damage.
4Reliability
If refresh timing is staggered across different groups to reduce peak current, then memory stability is improved, but control complexity increases
Solution Approach 1:
The patent divides pixels into manageable groups with assigned refresh timings, making the control complexity manageable through systematic organization. This segmentation approach successfully reduces peak current and improves memory stability while keeping control complexity at an acceptable level through structured group management.
Solution Approach 2:
The patent pre-assigns specific refresh timings to different pixel groups before operation begins. This preliminary action of establishing a staggered refresh schedule simplifies the control logic during actual operation, as the timing distribution is predetermined, making the implementation more straightforward despite the staggered approach.
Data Source
AI summary
A display device includes a display unit and a plurality of refreshing units. The display unit has a plurality of the display areas. Each of the display areas has a plurality of pixels. Each of the pixels has a memory. The refreshing units respectively control to refresh the pixels of the corresponding display areas at different time periods. Thus, the produced peak current during the pixel refreshing can be reduced, and the stored pixel data can be maintained.