LCD Driving Method for Signal Delay Compensation
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Solution Overview
Problem
Large LCDs experience signal delays due to increased line resistance, leading to inadequate charging time for pixels, resulting in nonuniform brightness and substandard image quality.
Innovation Solution
The driving method involves dividing the LCD display region into screen regions and using gamma voltage generators and complex programmable logic devices to adjust output voltage and operating times of source and gate drivers, respectively, to synchronize data and scan signals, ensuring proper charging of pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the LCD size is increased to provide larger display area, then the display area is improved, but the line resistance increases causing signal delay
Solution Approach 1:
The patent applies local quality by dividing the display into multiple regions and applying different driving methods to different regions. Specifically, the display is divided into a first region with a first driving method and a second region with a second driving method, allowing each region to be optimized for its specific characteristics and signal delay conditions.
2Area of stationary object
If the scanning line length is increased to cover larger display area, then the display area is improved, but the scan signal delay increases
Solution Approach 1:
The patent segments the display into multiple regions along the scanning direction. The first region is driven with a first driving method that includes a first hold period, while the second region is driven with a second driving method that includes a second hold period. This segmentation allows different timing characteristics to be applied to different regions, compensating for signal delay variations.
3Area of stationary object
If the data line length is increased to cover larger display area, then the display area is improved, but the data signal delay increases
Solution Approach 1:
The patent divides the display into multiple regions that are driven with different timing methods. The first region uses a first driving method with specific timing parameters, while the second region uses a second driving method with different timing parameters. This segmentation compensates for data signal delay by adjusting the charging timing in each region.
4Manufacturing precision
If the charging time for pixels is extended to improve display quality, then the image quality is improved, but the overall display refresh time increases
Solution Approach 1:
The patent applies different driving methods to different regions of the display. The first region is driven with a first driving method that includes a first hold period, while the second region is driven with a second driving method that includes a second hold period. This allows each region to have optimized charging time based on its specific signal delay characteristics, maintaining overall display quality without uniformly extending refresh time.
Data Source
AI summary
A liquid crystal display comprising a display region, a control unit, a plurality of source drivers located along a first direction, and a plurality of gate drivers located along a second direction orthogonal to the first direction. A driving method of the liquid crystal display comprises dividing the display region into a plurality of screen regions with each screen region is in correspondence with one source driver or one gate driver; according to the display characteristics of the screen regions. The control unit generates a plurality of regulated signals for changing the output voltage value of the corresponding driver or changing the operating time of the corresponding driver. The regulated signal are sent to the corresponding driver.