LCD Panel Block Segmentation for Thermal Response Compensation
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Solution Overview
Problem
Liquid crystal display (LCD) panels face reduced display quality due to temperature variations affecting response speed, leading to blurring or incorrect color display, especially when the backlight assembly is not uniformly positioned under the panel.
Innovation Solution
A method of driving the display panel by dividing it into blocks based on distance from the light source, using look-up tables to generate compensating signals that convert into grayscale voltage, improving response speed and display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the backlight assembly is disposed on side surfaces or upper/lower side surfaces of the light guide plate instead of entirely under the LCD panel, then the LCD panel can achieve smaller thickness and lighter weight, but the liquid crystal temperature varies according to position within the LCD panel causing display quality degradation
Solution Approach 1:
The LCD panel is divided into multiple blocks based on distance from the light source. Each block is assigned a dedicated look-up table for grayscale compensation. This segmentation allows different regions of the panel to receive customized compensation signals tailored to their specific temperature conditions, thereby maintaining display quality while using the thin-edge backlight configuration.
Solution Approach 2:
Different blocks of the LCD panel are provided with different look-up tables according to their distance from the light source. Blocks closer to the light source receive compensation parameters optimized for higher temperatures, while blocks farther away receive parameters for lower temperatures. This local differentiation compensates for temperature variations and maintains uniform display quality across the entire panel.
2Device complexity
If DCC driving uses a single look-up table for the entire LCD panel, then the device complexity is reduced, but the response speed imbalance caused by temperature variation cannot be compensated
Solution Approach 1:
The single look-up table is segmented into multiple block-specific look-up tables. Each block is assigned a dedicated table that contains compensation data optimized for that block's temperature conditions. This segmentation enables precise local compensation while maintaining a relatively simple overall control structure based on the DCC driving framework.
Solution Approach 2:
The system dynamically selects and applies different look-up tables based on the block identifier. The controller determines which look-up table to use for each block based on its position and temperature characteristics, allowing adaptive compensation in real-time. This dynamic selection enables the system to respond to temperature variations without requiring complex hardware modifications.
3Reliability
If the LCD panel is divided into multiple blocks with different look-up tables, then the response speed imbalance is compensated, but the device complexity increases
Solution Approach 1:
The control structure is segmented into block identification units and block-specific look-up table storage. Each block has a dedicated look-up table stored in memory, and the controller includes a selecting unit that chooses the appropriate table based on block identifier. This segmentation organizes the complexity in a structured manner that is manageable and implementable.
Solution Approach 2:
Multiple look-up tables are pre-stored in memory before operation. Each table contains pre-calculated compensation data for its corresponding block's temperature conditions. During operation, the controller simply needs to select the appropriate pre-stored table based on the block identifier, avoiding the need for real-time complex calculations and reducing the computational burden during actual display operation.
Data Source
AI summary
A driving unit of a display panel includes a control part, a gate driving part, a grayscale compensating part, and a data driving part. The control part provides a control signal and a grayscale signal. The gate driving part provides a gate signal to the display panel. The display panel is divided into a plurality of blocks according to a distance from a light source to each of the blocks. The grayscale compensating part outputs a compensating signal of an n-th frame using look-up tables, and the look-up tables respectively correspond to the blocks of the display panel. The data driving part converts the compensating signal of the n-th frame into a grayscale voltage and provides the grayscale voltage to the display panel. Accordingly, the driving unit of the display panel may improve a response speed of liquid crystals and display quality.