Charging Compensation for Display Panel Uniformity
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Solution Overview
Problem
Large-sized liquid crystal display panels face challenges with uneven charging due to differences in distance from the driving chip, leading to variations in brightness across the panel, affecting display quality.
Innovation Solution
A charging compensation device that adjusts charging currents based on distance from the driving module by dividing display data into multiple intervals, with each interval corresponding to different rows of pixel units, and using an operational amplifier to output appropriate charging signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single charging current is used for the entire display panel, then the charging process is simple, but the charging uniformity deteriorates due to distance differences from the driving chip
Solution Approach 1:
The display panel is divided into multiple charging intervals (first charging interval, second charging interval, etc.) based on distance from the driving chip. Each interval is assigned a different charging current value, transforming a uniform charging approach into a segmented, position-specific charging strategy that resolves the uniformity issue while maintaining manageable complexity
Solution Approach 2:
Different charging currents are applied to different regions (charging intervals) of the display panel according to their distance from the driving chip. The driving chip adjusts the charging current locally for each interval, ensuring that pixels farther away receive higher charging currents to compensate for voltage drop, thereby achieving uniform charging across the entire panel
2Area of stationary object
If the display panel size is increased, then the display performance is improved, but the charging uniformity deteriorates due to larger distance differences
Solution Approach 1:
As the display panel size increases, the number of charging intervals is increased accordingly. The driving chip divides the larger panel into more segments, each with its own charging current parameter. This segmentation allows the system to handle larger areas while maintaining charging uniformity by locally adapting the charging current to each region's distance from the driving chip
Solution Approach 2:
The patent introduces a new dimension of control by adding multiple charging current parameters corresponding to different spatial intervals. Instead of using a single charging current value, the system now operates with a multi-dimensional charging parameter set that accounts for position-dependent voltage drops across the enlarged display panel area
Data Source
AI summary
A charging compensation device includes: a timing control module configured to send a display data and a current row number information of a display panel; a driving module electrically connected to the timing control module, configured to divide the display data into at least two charging intervals according to a received row number information, and configured to determine a plurality of charging currents according to the at least two charging intervals, wherein each of the charging intervals corresponds to the display data of multiple rows of the pixel units, and distances between the pixel units corresponding to each of the charging intervals and the driving module are different; and an output module electrically connected to the driving module and configured to charge the display panel according to the plurality of charging currents.