Segmented Data Driver LSI for Dot Inversion Driving
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Solution Overview
Problem
Current TFT liquid crystal display technologies face challenges in achieving high image quality with low power consumption and cost, particularly with dot inversion driving methods that require high withstand voltage for driver LSIs, leading to increased costs and power consumption.
Innovation Solution
The solution involves dividing the data driver LSI output into regions for first and second polarities, using a switch array to reduce data line potential amplitude, and employing level shifters and booster circuits to lower the withstand voltage, allowing for dot inversion driving with reduced power consumption and cost while maintaining image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If dot inversion driving is used to improve image quality, then image quality is improved, but driver LSI withstand voltage increases and power consumption increases
Solution Approach 1:
The liquid crystal display is divided into two sets of liquid crystal pixels (first set and second set) arranged in a staggered manner. The data driver LSI is segmented into a first output part and a second output part, each driving different sets of liquid crystal pixels with different polarities. This segmentation allows each output part to operate at lower voltage levels, reducing overall power consumption while maintaining dot inversion driving benefits for image quality.
Solution Approach 2:
Different regions of the display are assigned different polarity characteristics. The first output part drives liquid crystal pixels with first polarity, while the second output part drives liquid crystal pixels with second polarity. This local differentiation allows optimization of voltage levels in different regions, reducing the withstand voltage requirement for the driver LSI while preserving the image quality benefits of dot inversion driving.
2Manufacturing precision
If dot inversion driving is used to improve image quality, then image quality is improved, but driver LSI withstand voltage increases leading to increased cost
Solution Approach 1:
The data driver LSI is divided into separate output parts (first output part and second output part) that can be manufactured with different voltage ratings. This segmentation allows the use of lower-cost, lower-voltage components while still achieving dot inversion driving functionality, thereby reducing overall manufacturing cost while maintaining image quality.
Solution Approach 2:
Different output parts of the driver LSI are designed with different polarity characteristics matching their driven liquid crystal pixel sets. This local optimization allows each section to be manufactured with appropriate voltage levels, avoiding the need for expensive high-voltage components across the entire driver, thus reducing cost while preserving image quality.
3Use of energy by moving object
If common inversion driving or line inversion driving is used to reduce power consumption, then power consumption is reduced, but image quality degrades due to smear and flickering
Solution Approach 1:
The display is segmented into two independently driven sets of liquid crystal pixels with different polarities. This segmentation enables dot inversion driving for each set, eliminating the smear and flickering problems associated with common inversion or line inversion driving, while the staggered arrangement allows for reduced power consumption through optimized voltage levels in each segment.
Data Source
AI summary
A data driver circuit is divided into a low potential region, an intermediate potential region, and a high potential region, and relative withstand voltages in the respective regions are set equal to each other. Both of the transmission of a power source voltage to the high potential region from the low potential region and the transmission of video signals are performed via the intermediate potential region. Due to such a constitution, the withstand voltages in the respective regions can be suppressed to low values.