Liquid crystal display and method for driving the same
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Solution Overview
Problem
Liquid crystal displays face high power consumption when displaying certain patterns, such as the horizontal stripe pattern, due to the sequential addressing mode, which makes it difficult to reduce power consumption effectively.
Innovation Solution
A liquid crystal display system that includes a timing controller to output scan output enable signals and address signals, allowing the scan driver to supply scan signals to odd and even scan lines differently, and the data driver to supply data voltages in a manner that minimizes the swing cycle of data voltages, thereby reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If sequential addressing mode is used to supply scan signals to scan lines, then the liquid crystal display can be driven with simple control logic, but power consumption increases when displaying certain patterns such as horizontal stripe pattern
Solution Approach 1:
The patent divides the scan lines into two separate groups: odd scan lines and even scan lines. Two separate scan output enable signals (GOE1 and GOE2) are generated to independently control the scanning of these two groups. This segmentation allows different scanning sequences to be applied to different line groups, enabling optimization of power consumption for specific display patterns while maintaining simple control logic through modular signal generation.
2Reliability
If frame inversion method is used to supply data voltages, then flicker and direct current image sticking are prevented, but power consumption increases when displaying patterns with high contrast requirements
Solution Approach 1:
The patent dynamically adjusts the scanning sequence based on the display pattern being rendered. By generating different scan output enable signals for odd and even scan lines, the system can adapt the scanning order to match the spatial distribution of pixels requiring voltage updates. This dynamic adaptation reduces unnecessary voltage swings while maintaining the frame inversion method's benefits of preventing flicker and image sticking.
3Device complexity
If data voltages are supplied in fixed order to all pixels, then the data driver operation is simplified, but the swing cycle of data voltages cannot be extended to reduce power consumption
Solution Approach 1:
The patent introduces a temporal dimension to the scanning process by creating separate time slots for scanning odd scan lines and even scan lines. Through the use of two scan output enable signals with different timing, the system extends the overall swing cycle of data voltages without complicating the data driver's internal operation. Each data voltage can be supplied to its target pixels in the natural sequence while the overall scanning process is stretched out in time.
Data Source
AI summary
A liquid crystal display includes: a display panel including data lines, scan lines and a plurality of pixels connected to the data lines and the scan lines; a scan driver configured to supply scan signals to the scan lines; a data driver configured to supply data voltages to the data lines; and a timing controller configured to control operation timings of the scan driver and the data driver, where the timing controller is configured to output a plurality of scan output enable signals to the scan driver, and the scan driver is configured to supply odd scan signals to odd scan lines based on a first scan output enable signal of the scan output enable signals and to supply even scan signals to even scan lines based on a second scan output enable signal of the scan output enable signals.